Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and an electric device, and belongs to the technical field of batteries. Wherein the battery monomer comprises a shell part, a pole part and an electrode part, and the shell part is provided with a containing cavity and comprises a first shell wall which participates in forming the containing cavity; the electrode component is accommodated in the accommodating cavity; the pole component and the first shell wall are located on the same side of the electrode component, the pole component is installed on the first shell wall, the electrode component is connected with the pole component through the conductive part, a containing groove communicated with the containing cavity is formed in the pole component, the containing groove is open towards the direction of the electrode component, and at least part of the containing groove is defined by the pole component; at least part of the conductive part is contained in the containing groove. By arranging the accommodating groove for accommodating the conductive part, the space of the accommodating cavity occupied by the conductive part can be reduced, so that the accommodating cavity has a larger space for accommodating the active substance coating part, the volume of the active substance coating part is favorably increased, and the energy density of the battery monomer is increased.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. Among them, power batteries include several battery cells. However, the energy density of battery cells and power batteries needs to be further improved. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can improve the energy density of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell component, a pole component and an electrode component, the shell component having a accommodating cavity, and comprising a first shell wall that participates in forming the accommodating cavity; the electrode component is accommodated in the accommodating cavity; the pole component and the first shell wall are located on the same side of the electrode component and are installed on the first shell wall, the electrode component is connected to the pole component through a conductive portion, a accommodating groove that is connected to the accommodating cavity is formed at the pole component, the accommodating groove is open toward the direction of the electrode component, and is at least partially surrounded by the pole component, and at least a portion of the conductive portion is accommodated in the accommodating groove.

[0005] In the above technical solution, by providing a receiving groove to accommodate the conductive part, the space occupied by the conductive part in the receiving cavity can be reduced, so that the receiving cavity has a larger space to accommodate the active material coating part, which is conducive to increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open in the direction of the electrode component, the conductive part can be easily extended into the receiving groove, reducing the difficulty of operation. In addition, by arranging the first shell wall and the pole component on the same side of the electrode component, the installation distance of the pole component can be shortened, and the reliability of the battery cell can be improved.

[0006] In some embodiments, the receiving groove is recessed relative to the first shell wall in a direction away from the electrode component.

[0007] In the above technical solution, at least part of the accommodating groove extends outward beyond the first shell wall, thereby further reducing the space occupied by the conductive part in the accommodating cavity, so that the accommodating cavity has a larger space to accommodate the active material coating part, which is beneficial to increase the volume of the active material coating part, thereby increasing the energy density of the battery cell.

[0008] In some embodiments, the pole component includes a pole body connected to the conductive portion, a surface of the pole body facing the electrode component is an inner end surface of the pole body, and the inner end surface of the pole body participates in forming the accommodating groove.

[0009] In the above technical solution, at least part of the accommodating groove is surrounded by the surface of the pole body on one side facing the electrode component, and the conductive part received in the accommodating groove can easily contact and connect to the inner end surface of the pole body, thereby improving the connection convenience and simplifying the structure.

[0010] In some embodiments, the pole component includes a pole body, a first transition structure and a first insulating structure, the first transition structure surrounds the pole body and is connected to the first shell wall, the first insulating structure is insulated and sealed between the first transition structure and the pole body, the conductive part is connected to the pole body, and the accommodating groove includes a first accommodating groove surrounded by the pole component.

[0011] In the above technical solution, since the pole component includes not only the pole body but also the first adapter structure connected to the first shell wall, and the first insulating structure that plays an insulating and sealing role is set between the first adapter structure and the pole body, when the pole component is installed on the first shell wall and the first adapter structure is connected to the first shell wall, there is no need to set a seal between the first adapter structure and the first shell wall, and there is no need to apply a large sealing pressure to meet the compression degree of the seal there, so that the force on the first shell wall can be reduced, which plays a role in protecting the shell component, thereby helping to reduce the wall thickness of the shell component and reduce material costs. In addition, the pole component of this structural form encloses the first accommodating groove, which is convenient for flexible processing of the first accommodating groove and easy to design the shape and volume of the first accommodating groove.

[0012] In some embodiments, an outer contour of an orthographic projection of the first receiving groove on the first shell wall is located at the periphery of an outer contour of an orthographic projection of the pole body on the first shell wall.

[0013] In the above technical solution, by setting the orthographic projection of the pole body on the first wall to fall within the outer contour of the orthographic projection of the first accommodating groove on the first wall, the range of the first accommodating groove is larger, which is conducive to accommodating the conductive part to a greater extent and facilitating the connection between the conductive part and the pole body.

[0014] In some embodiments, the first receiving groove is formed on the pole body and the side of the first transition structure facing the electrode component.

[0015] In the above technical solution, since the first accommodating groove includes both a portion formed on the inner side of the pole body and a portion formed on the inner side of the first adapter structure, the orthographic projection of the pole body on the first wall can fall within the outer contour of the orthographic projection of the first accommodating groove on the first wall, the processing of the first accommodating groove is convenient and easy.

[0016] In some embodiments, the first accommodating groove is formed on the side of the pole body and the first adapter structure facing the electrode component, and the first adapter structure bulges relative to the first shell wall in the direction away from the electrode component, so that the first accommodating groove is recessed relative to the first shell wall in the direction away from the electrode component.

[0017] In the above technical solution, by processing the first adapter structure into a protruding bulge, a part of the first accommodating groove is formed on the side of the pole body facing the electrode component, and another part of the first accommodating groove is formed on the side of the first adapter structure facing the electrode component, and the first accommodating groove is in a shape that is recessed relative to the first shell wall in the direction away from the electrode component, so that the side of the pole body facing the electrode component and the side of the first adapter structure facing the electrode component both have space to accommodate the conductive part. In this way, it is not only convenient to accommodate the conductive part to a greater extent, but also conducive to the design of diversified forms of the conductive part.

[0018] In some embodiments, the inner end surface of the pole body and the inner end surface of the first adapter structure together form a first accommodating groove.

[0019] In the above technical solution, the first receiving groove can be enclosed relatively simply, and the inner end surface of the pole body can constitute a partial groove wall of the first receiving groove, so that the conductive part received in the first receiving groove can be easily contacted and connected to the pole body, thereby improving the connection convenience and simplifying the structure.

[0020] In some embodiments, the first adapter structure includes a first adapter ring and a second adapter ring, the second adapter ring is arranged on the side of the first adapter ring facing away from the electrode component, the outer ring of the first adapter ring is connected to the first shell wall, the inner ring of the first adapter ring and the inner ring of the second adapter ring jointly clamp the pole body through the first insulating structure; the first accommodating groove is formed on the side of the first adapter ring and the pole body facing the electrode component, the first adapter ring is raised relative to the first shell wall in the direction away from the electrode component, so that the first accommodating groove is recessed relative to the first shell wall in the direction away from the electrode component, and the second adapter ring is connected to the raised part of the first adapter ring.

[0021] In the above technical solution, the first adapter structure includes a first adapter ring and a second adapter ring which are arranged inside and outside and assembled and connected, so as to facilitate the assembly and connection of the first adapter structure with the first insulating structure and the pole body, and make the pole component easy to process and manufacture. Moreover, by connecting the outer ring of the first adapter ring with the first shell wall, and connecting the second adapter ring with the raised part of the first adapter ring, the position where the second adapter ring is connected to the first adapter ring and the position where the first adapter ring is connected to the first shell wall are spaced apart in two spatial dimensions, so as to reduce the mutual thermal influence when the two positions are welded separately, and improve the connection reliability between the second adapter ring and the first adapter ring, and the connection reliability between the first adapter ring and the first shell wall.

[0022] In some embodiments, the pole body includes a peripheral portion, and the first insulating structure includes a sealing structure; the sealing structure is an integrally formed part, and is clamped between the first adapter ring and the peripheral portion, and between the second adapter ring and the peripheral portion; or the first insulating structure also includes a first insulating member, the sealing structure is clamped between the first adapter ring and the peripheral portion, and the second adapter ring is insulated and fixedly fitted with the pole body through the first insulating member.

[0023] In the above technical solution, the first insulating structure has flexible and diverse structural forms, is easy to assemble, and is conducive to sealing.

[0024] In some embodiments, the first adapter structure includes a third adapter ring, the outer ring of the third adapter ring is connected to the first shell wall, the third adapter ring includes an integrally arranged first extension portion and a second extension portion, the second extension portion is connected to the side of the first extension portion facing away from the electrode component, and the first extension portion and the second extension portion jointly clamp the pole body through the first insulating structure; the first accommodating groove is formed on the side of the third adapter ring and the pole body facing the electrode component, and the third adapter ring bulges relative to the first shell wall in the direction away from the electrode component, so that the first accommodating groove is recessed relative to the first shell wall in the direction away from the electrode component.

[0025] In the above technical solution, since the third adapter ring includes the first extension portion and the second extension portion that are integrally arranged, the first extension portion and the second extension portion are integrated into the same structural component, thereby eliminating the process of connecting the first extension portion and the second extension portion, reducing the use of parts, and the first extension portion and the second extension portion are not easy to separate, which can improve the clamping reliability of the pole body through the first insulating structure.

[0026] In some embodiments, the pole body includes a peripheral portion, and the first insulating structure includes a sealing structure; the sealing structure is an integrally formed part, and is clamped between the first extension portion and the peripheral portion, and between the second extension portion and the peripheral portion; or the first insulating structure also includes a first insulating member, the sealing structure is clamped between the first extension portion and the peripheral portion, and the first insulating member is clamped between the second extension portion and the peripheral portion.

[0027] In the above technical solution, the first insulating structure has flexible and diverse structural forms, is easy to assemble, and is conducive to sealing.

[0028] In some embodiments, the first adapter structure includes a fourth adapter ring, the fourth adapter ring includes a mating ring portion, the pole body is passed through the mating ring portion and is clamped on both inner and outer sides of the mating ring portion by a first insulating structure; the first accommodating groove is formed on the side of the fourth adapter ring and the pole body facing the electrode component, and the fourth adapter ring is raised relative to the first shell wall in a direction away from the electrode component, so that the first accommodating groove is recessed relative to the first shell wall in a direction away from the electrode component.

[0029] In the above technical solution, the fourth adapter ring is clamped by the pole body, so that the structure of the pole component is simple and easy to process, and the relative fixation and insulation matching of the pole body and the first adapter structure can be simply and effectively achieved.

[0030] In some embodiments, the pole body includes a penetration portion penetrated through the mating ring portion, and an inner limit portion and an outer limit portion connected to the penetration portion and clamped on the inner and outer sides of the mating ring portion; the first insulating structure includes a sealing structure; the sealing structure is an integrally formed part, and is clamped between the inner limit portion and the mating ring portion, and between the outer limit portion and the mating ring portion at the same time; or the first insulating structure also includes a second insulating member, the sealing structure is clamped between the mating ring portion and the inner limit portion, and the second insulating member is clamped between the outer limit portion and the mating ring portion.

[0031] In the above technical solution, the first insulating structure has flexible and diverse structural forms, is easy to assemble, and is conducive to sealing.

[0032] In some embodiments, the inner end surface of the pole body and the inner end surface of the first adapter structure both participate in forming a first accommodating groove, and the position of the inner end surface of the first adapter structure adjacent to the pole body is a surrounding area surrounding the pole body, and the surrounding area is flush with the inner end surface of the pole body.

[0033] In the above technical solution, when the inner end surface of the pole body is small, a part of the pole connecting part of the conductive part can be laid flat on the inner end surface of the pole body, and the remaining part can be laid flat on the surrounding area, so that the pole connecting part of the conductive part can be supported as a whole, which is convenient for tightening the welding nozzle, so that the conductive part can be reliably connected to the pole body.

[0034] In some embodiments, the inner end surface of the pole body and the inner end surface of the first adapter structure both participate in forming a first accommodating groove, the position of the inner end surface of the first adapter structure adjacent to the pole body is a surrounding area surrounding the pole body, and the inner end surface of the pole body protrudes out of the surrounding area toward the direction of the electrode component.

[0035] In the above technical solution, by setting the inner end face of the pole body to protrude from the surrounding area in the direction of the electrode component, when the height of the pole body is constant, it is equivalent to retracting the pole body in the direction of the accommodating cavity, so as to reduce the space occupied by the pole component outside the shell component and reduce the size of the battery cell in the direction of setting the pole component.

[0036] In some embodiments, the first adapter structure is formed into a long strip extending along the length direction of the first shell wall, and the contour shape of the pole body matches the contour shape of the first adapter structure.

[0037] In the above technical solution, the inner end surface of the pole body is relatively large, which is conducive to laying the pole connecting part of the conductive part flat on the inner end surface of the pole body, which is conducive to increasing the connection area between the conductive part and the pole body, thereby improving the charging performance.

[0038] In some embodiments, the first adapter structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged in the center of the first adapter structure and has a circular outline.

[0039] In the above technical solution, when the first adapter structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged at the length center position of the adapter structure and is circular, the connection position between the first adapter structure and the pole body is subjected to uniform force, and it is easy to control the compression amount of the first insulating structure to improve the reliability of the sealing cooperation between the two, and the sealing area is relatively small and not easy to fail.

[0040] In some embodiments, the first adapter structure is formed as a long strip extending along the length direction of the first shell wall, the pole body is arranged in the center of the first adapter structure and has a circular outline; the conductive part includes a pole ear part and a conductive member connected to the pole ear part, the conductive member includes a first conductive segment laid on the inner end surface of the pole body, and a second conductive segment offset from the inner end surface of the pole body, the second conductive segment protrudes relative to the first conductive segment in a direction away from the electrode component, and the pole ear part is connected to the second conductive segment.

[0041] In the above technical solution, when the first adapter structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged at the length center of the adapter structure and is circular, the connection position of the first adapter structure and the pole body is evenly stressed, and it is easy to control the compression amount of the first insulating structure to improve the reliability of the sealing fit between the two, and the sealing area is relatively small and not easy to fail. In addition, by setting the conductive part to include the first conductive segment and the second conductive segment, the height difference of the inner end surface of the pole body relative to the surrounding area can be used to accommodate the second conductive segment and the pole ear part of the conductive part, so that the space can be fully utilized, the space occupied by the conductive part in the accommodating cavity can be reduced, and the energy density of the battery cell can be improved.

[0042] In some embodiments, the outer contour of the orthographic projection of the first receiving groove on the first shell wall is located within the outer contour range of the orthographic projection of the pole body on the first shell wall.

[0043] In the above technical solution, it is helpful to meet the requirement that the range of the first accommodating groove is smaller than that of the pole body.

[0044] In some embodiments, the first adapter structure includes an enclosure portion located on a side of the pole body close to the electrode component, the enclosure portion surrounds the avoidance hole, the pole body cover is arranged on the side of the avoidance hole away from the electrode component, the first accommodating groove includes a first groove surrounded by the enclosure portion and the pole body and recessed in a direction away from the electrode component, the conductive portion is connected to the pole body through the first groove, and the outer contour of the orthographic projection of the first groove on the first shell wall falls within the outer contour range of the orthographic projection of the pole body on the first shell wall.

[0045] In the above technical solution, by providing a step difference between the pole body and the surrounding portion, the first groove can be naturally formed by the relative position of the pole body and the first adapter structure, and the first groove is easily obtained.

[0046] In some embodiments, the first transition structure bulges relative to the first shell wall in a direction away from the electrode component to define a base groove that is recessed relative to the first shell wall in a direction away from the electrode component. The base groove is open in the direction of the electrode component and is connected to the side of the first groove facing the electrode component. The conductive portion extends into the first groove through the base groove and is connected to the pole body.

[0047] In the above technical solution, the first receiving groove includes a base groove and a first groove, and the conductive part is connected to the pole body through the base groove and the first groove, thereby increasing the volume of the first receiving groove and further reducing the space occupied by the conductive part in the receiving cavity.

[0048] In some embodiments, the pole body includes a first pole piece and a second pole piece, the second pole piece is connected to the first adapter structure and defines a matching hole, the first pole piece is assembled on the side of the second pole piece away from the electrode component and covers the matching hole, the first accommodating groove includes a second groove surrounded by the first pole piece and the second pole piece, and the outer contour of the positive projection of the second groove on the first shell wall falls within the outer contour range of the positive projection of the pole body on the first shell wall.

[0049] In the above technical solution, the pole body is configured to be assembled from two parts so as to define the second groove by itself, thereby facilitating the acquisition of the second groove.

[0050] In some embodiments, the first transition structure bulges relative to the first shell wall in a direction away from the electrode component to define a base groove that is recessed relative to the first shell wall in a direction away from the electrode component. The base groove is open in the direction of the electrode component and is connected to the side of the second groove facing the electrode component. The conductive portion extends into the second groove through the base groove and is connected to the pole body.

[0051] In the above technical solution, the first receiving groove includes a base groove and a second groove, and the conductive part is connected to the pole body through the base groove and the second groove, thereby increasing the volume of the first receiving groove and further reducing the space occupied by the conductive part in the receiving cavity.

[0052] In some embodiments, the pole component is covered on the side of the first shell wall away from the electrode component, the pole component includes a pole body, a second adapter structure and a second insulating structure, the second adapter structure surrounds the pole body and is connected to the first shell wall, the second insulating structure is insulated and fitted between the second adapter structure and the pole body, and the conductive part is connected to the pole body; the first shell wall is provided with a mounting hole, a sealing ring is arranged around the mounting hole, the sealing ring is clamped between the pole component and the first shell wall, the pole component and the sealing ring form a second accommodating groove which is recessed in the direction away from the electrode component, and the accommodating groove includes a second accommodating groove.

[0053] In the above technical solution, the pole component has a simple structure, is easy to process, and is easily assembled and connected with the first shell wall to define the second accommodating groove.

[0054] In some embodiments, the pole component includes a pole body, the conductive part is connected to the pole body, the pole body includes a first pole piece and a second pole piece, the second pole piece is connected to the first shell wall and defines a matching hole, the first pole piece is assembled on the side of the second pole piece away from the electrode component, and the accommodating groove includes a third accommodating groove jointly surrounded by the first pole piece and the second pole piece.

[0055] In the above technical solution, the pole body is configured to be assembled from two parts so as to define the third receiving groove by itself, thereby facilitating the acquisition of the third receiving groove.

[0056] In some embodiments, the inner end surface of the pole body includes a matching area that participates in defining the slot wall of the accommodating slot, the conductive portion is connected to the matching area through the accommodating slot, and the matching area is formed as a long strip area extending along the length direction of the first shell wall.

[0057] In the above technical solution, the matching area of ​​the inner end surface of the pole body is relatively large, which is conducive to laying the pole connecting part of the conductive part flat on the matching area of ​​the inner end surface of the pole body, which is conducive to increasing the connection area between the conductive part and the pole body, thereby improving the charging performance.

[0058] In some embodiments, the inner end surface of the pole body includes a matching area that participates in defining a slot wall of the receiving slot, the conductive portion includes a pole ear portion and a conductive member connected to the pole ear portion, and the conductive member is connected to the matching area through the receiving slot.

[0059] In the above technical solution, by providing an adapter, the shape and material of the conductive part can be flexibly adjusted to meet the connection requirements of different positions.

[0060] In some embodiments, the conductive member includes a first conductive segment laid in the matching area, the conductive member includes a third conductive segment offset from the matching area, the third conductive segment protrudes toward the electrode component relative to the first conductive segment, and the pole ear is connected to the third conductive segment.

[0061] In the above technical solution, the adapter can not only meet the connection requirements with the matching area, but also easily meet the connection requirements with the pole ear part.

[0062] In some embodiments, the first shell wall includes a raised structure that rises in a direction away from the electrode component, and a mounting hole passes through the raised structure. The pole component is arranged at the mounting hole and forms a fourth accommodating groove with the raised structure that is recessed in a direction away from the electrode component, and the accommodating groove includes a fourth accommodating groove.

[0063] In the above technical solution, the fourth accommodating groove is constructed by designing the step shape of the first shell wall, so that the design of the pole component can be more diverse.

[0064] In some embodiments, the electrode component includes an active material coating portion received in the receiving cavity, and a pole ear portion connected to the active material coating portion, at least a portion of the pole ear portion is received in the receiving groove and extends to and is connected to the pole column component.

[0065] In the above technical solution, the use of the conductive member can be omitted, and the connection process between the conductive member and the pole ear portion can be omitted.

[0066] In some embodiments, the pole component includes a pole body, a side surface of the pole body facing the electrode component is an inner end surface of the pole body, the inner end surface of the pole body participates in forming a receiving groove, and the pole ear portion includes a gathered portion formed by stacking and connecting multiple layers of pole ear sheets, at least part of the gathered portion is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body.

[0067] In the above technical solution, by laying at least part of the gathered portion on the inner end surface of the pole body and connecting with the inner end surface of the pole body, it is beneficial to increase the connection area, connection reliability and current carrying capacity between the pole ear and the pole body.

[0068] In some embodiments, the gathered portion is completely laid on the inner end surface of the pole body.

[0069] In the above technical solution, the gathering portion can be in a completely flattened state, and the projection of the gathering portion falls completely on the inner end face of the pole body. In this way, the pole ear portion will not be damaged due to the bending of the gathering portion, thereby improving the charging performance of the pole ear portion, and is beneficial to increasing the connection area between the inner end face of the pole body and the gathering portion, improving the current passing efficiency, and facilitating the welding nozzle to tighten the gathering portion, thereby improving the connection reliability between the gathering portion and the pole body.

[0070] In some embodiments, the electrode component includes an active material coating portion accommodated in the accommodating cavity, and a pole ear portion connected to the active material coating portion, the conductive portion includes a conductive member and the pole ear portion, the pole ear portion is connected to the pole component through the conductive member, and at least a portion of the conductive member is accommodated in the accommodating groove.

[0071] In the above technical solution, the pole ear part and the pole column component are indirectly connected by a conductive part, which can shorten the length of the pole ear part and improve the problems of wrinkling, bending and breaking of the pole ear piece. Moreover, the shape and material of the conductive part can be flexibly designed to reduce the difficulty of connecting the conductive part and the pole column component, thereby improving the convenience and reliability of connecting the conductive part and the pole column component.

[0072] In some embodiments, the conductive member includes a first connecting section, the first connecting section includes two clamping portions, the pole lug portion includes a pole lug end portion, and the pole lug end portion is clamped between the two clamping portions and connected to the clamping portions.

[0073] In the above technical solution, the two clamping parts can be used to limit the end of the pole ear, thereby improving the connection reliability of the multi-layer pole ear sheets in the end of the pole ear. In addition, in some examples, by providing two clamping parts, the end of the pole ear clamped between the two clamping parts can be in the state of a laminated part, and the step of connecting the multi-layer pole ear sheets in the laminated part to form a gathered part can be omitted, thereby simplifying the processing process and improving the processing efficiency.

[0074] In some embodiments, the pole component includes a pole body, the surface of one end of the pole body facing the electrode component is the inner end surface of the pole body, the conductive member includes a second connecting segment, the second connecting segment is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body, the conductive member is bent at the connection position between the first connecting segment and the second connecting segment, so that the first connecting segment is located on the side of the second connecting segment away from the pole body, and one of the clamping portions is supported on the side of the pole ear end away from the pole body.

[0075] In the above technical solution, the redundancy of the pole ear portion can be improved by the clamping portion supporting the pole ear portion, and the risk of short circuit caused by the pole ear portion being inserted into the active material coating portion can be reduced. In addition, the bent conductive member can play a role of buffer support, reducing the risk of the electrode component hitting the first shell wall, and improving the reliability of the battery cell.

[0076] In some embodiments, the pole ear portion includes a gathered portion formed by stacking and connecting multiple pole ear sheets, the conductive member includes a first connecting segment, the gathered portion is stacked on one side of the first connecting segment in a thickness direction and connected to the first connecting segment.

[0077] In the above technical solution, the first connecting section is in the form of a plate, and the thickness direction of the first connecting section is consistent with that of the gathering portion, and the two are overlapped along the thickness direction of the first connecting section, so that the matching mode between the gathering portion and the conductive part is simple, which is conducive to improving production efficiency.

[0078] In some embodiments, the pole component includes a pole body, the surface of the pole body at one end facing the electrode component is the inner end surface of the pole body, and the first connecting section is supported on the side of the retracted portion facing away from the pole body so that the retracted portion is clamped between the inner end surface of the pole body and the first connecting section.

[0079] In the above technical solution, the redundancy of the pole ear portion can be improved by supporting the gathered portion through the first connecting section, and the risk of short circuit caused by the pole ear portion being invertedly inserted into the active material coating portion can be reduced.

[0080] In some embodiments, the pole component includes a pole body, the electrode component includes an active material coating portion accommodated in a receiving cavity, the active material coating portion is connected to the pole body through a conductive portion, the conductive portion is bent to form at least two open grooves, wherein the opening directions of the two open grooves are different and they are adjacent in the direction from the pole body to the active material coating portion.

[0081] In the above technical solution, the conductive part can be in a reciprocating serpentine shape, and the conductive part can play a buffering role. When the battery cell is used in a vibration environment, it can reduce the impact of the active material coating part toward the first shell wall, play a role in protecting the electrode components, and improve the reliability of the battery cell. In addition, since the conductive part does not extend randomly, it can improve the mutual interference and scratching between the pole tabs in the conductive part, and the risk of the pole tabs being inserted into the active material coating part, thereby further improving the reliability of the battery cell.

[0082] In some embodiments, the electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion is connected to the pole body through the pole ear portion, and the pole ear portion is bent alone to form two open grooves with openings facing opposite and adjacent to each other; or, the electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion includes the pole ear portion and a conductive member connected to the pole ear portion, the pole ear portion is connected to the pole body through the conductive member, and the conductive member and the pole ear portion are bent together to form two open grooves with openings facing opposite and adjacent to each other.

[0083] In the above technical solution, the conductive part can be in a reciprocating bending shape, so that the length of the conductive part can be shortened, the structure of the conductive part can be simplified, and the processing of the conductive part can be facilitated.

[0084] In some embodiments, the electrode component includes a plurality of electrode assemblies that are stacked, and the electrode tabs of the plurality of electrode assemblies are gathered toward the receiving groove.

[0085] In the above technical solution, the receiving groove is conducive to accommodating the conductive part to a greater extent, which is conducive to further reducing the space occupied by the conductive part in the receiving cavity, and is conducive to improving the energy density of the battery cell.

[0086] In some embodiments, the shell component includes a shell body that participates in forming the accommodating cavity, the shell body is a semi-closed cylindrical shape and has an opening at one end, and the end of the shell body opposite to the opening serves as a first shell wall, or the shell component includes a shell cover that participates in forming the accommodating cavity, the shell cover is plate-shaped and serves as the first shell wall.

[0087] In the above technical solution, the structural design of the shell component is flexible, and the setting position of the pole component is flexible. In addition, when the end of the shell body opposite to the opening is the first shell wall, since the electrode component housed in the shell component is connected to the pole component installed on the first shell wall, when the battery vibrates or deforms, the pole components connected by the converging component will be pulled against each other. Since the pole component is arranged on the end wall of the shell body opposite to the opening, the force applied to the pole component will be preferentially transmitted to the shell body, and will not directly act on the shell cover, so that not only can the distance of the force applied to the weld of the shell body and the shell cover be extended, but also the shell body will preferentially deform when subjected to force, so as to reduce the force applied to the weld of the shell body and the shell cover, thereby effectively reducing the probability of cracking at the weld of the shell body and the shell cover during the use of the battery, and improving the reliability of the battery cell. In addition, since the connection position of the shell body and the shell cover is not easy to crack, there is no need to increase the wall thickness of the two in order to increase the connection reliability between the two, which is conducive to reducing the weight and material cost, and is conducive to miniaturization of the battery cell, or improving the energy density of the battery cell.

[0088] In some embodiments, the battery cell further includes a pressure relief device, which is disposed on the housing component and is located on the same side or on the opposite side as the pole component.

[0089] In the above technical solution, when the pressure relief device and the pole component are located on the same side, the design of the shell walls other than the first shell wall can be simplified, and the structure and processing of the battery cell can be simplified. When the pressure relief device and the pole component are located on different sides, there is no need to consider the space occupied by the pressure relief device on the first shell wall, and the volume of the pole component is reduced, so that the shape and volume of the pole component can be flexibly designed according to needs.

[0090] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell of any of the above-mentioned solutions.

[0091] In the above technical solution, since the energy density of the battery cell according to the embodiment of the present application is improved, it is beneficial to improve the energy density of the battery.

[0092] In some embodiments, the battery includes a box body, a plurality of battery cells are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

[0093] In the above technical solution, when the pole component of the battery cell is arranged on the side of the shell component facing the bottom plate of the box body, the battery cell is in an inverted state, and the decompression product is sprayed in the direction away from the passenger compartment, which is safer; when the pole component of the battery cell is arranged on the side of the shell component close to the bottom plate of the box body, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the flexible setting of the orientation of the battery cell and the box body can be achieved.

[0094] In a third aspect, an embodiment of the present application further provides an electrical device, comprising a battery according to any of the above solutions.

[0095] In the above technical solution, since the performance of the battery is improved, it is beneficial to improve the working power performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0096] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0097] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0098] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0099] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0100] Figure 4 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0101] Figure 5 for Figure 4 A partial enlarged view of

[0102] Figure 6 A top view of a battery cell provided for some embodiments of the present application;

[0103] Figure 7 For along Figure 6 Sectional view along line AA;

[0104] Figure 8 A schematic diagram of a pole component provided for some embodiments of the present application;

[0105] Fig. 9 for Figure 8 A top view of the pole component shown in ;

[0106] Fig.10 For along Fig. 9 The view from direction B shown in FIG.

[0107] Fig.11 For along Fig. 9 Sectional view of the mid-CC line;

[0108] Fig.12 To adopt Fig.11 A front view of a battery cell with a pole component shown in FIG.

[0109] Fig.13 for Fig.12 A top view of a battery cell shown in ;

[0110] Fig.14 for Fig.12 A side view of a battery cell shown in , wherein the dotted lines in the figure represent electrode components within the housing;

[0111] Fig.15 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0112] Fig.16 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0113] Fig.17 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0114] Fig.18 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0115] Fig.19 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0116] Fig. 20 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0117] Fig.21 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0118] Fig. 22 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0119] Fig.23 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0120] Fig.24 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0121] Fig.25 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0122] Fig.26 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0123] Fig. 27 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0124] Fig.28 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0125] Figure 29A-Figure 29D An exploded view of the processing process of a battery cell provided by one embodiment of the present application;

[0126] Figure 30A-Figure 30C An exploded view of the processing process of a battery cell provided by one embodiment of the present application;

[0127] Fig.31 An exploded view of a portion of a battery cell provided in some embodiments of the present application.

[0128] Reference numerals:

[0129] Vehicles 1000;

[0130] Battery 100; Controller 200; Motor 300;

[0131] Box body 101; first box part 1011; second box part 1012;

[0132] Battery cell 102; first direction F1; second direction F2; third direction F3;

[0133] fourth direction F4; fifth direction F5;

[0134] Shell component 1; shell body 11; first shell wall 111;

[0135] Shell wall inner end surface 1110; ridge structure 1114;

[0136] Mounting hole 112; opening 113; second shell wall 114;

[0137] Shell cover 12; accommodating chamber 13; sealing ring 14;

[0138] Pole component 2;

[0139] Pole body 21; inner end surface 211 of the pole body; matching area 211a;

[0140] Peripheral portion 212; penetration portion 214; riveting portion 2141;

[0141] Inner limiting portion 215; outer limiting portion 216;

[0142] First pole piece 21a; second pole piece 21b; matching hole 21b1;

[0143] First transfer structure 22a; surrounding portion 22a1;

[0144] Inner end surface 220 of the first transition structure; surrounding area 2201;

[0145] First adapter ring 221; first step portion 2211;

[0146] A second adapter ring 222; a stop ring portion 2221;

[0147] A third adapter ring 223; a first extension portion 2231;

[0148] A second extension portion 2232; a second step portion 2233;

[0149] A first insulating structure 23a; a sealing structure 231;

[0150] A first insulating member 232; a second insulating member 234;

[0151] A second transfer structure 22b;

[0152] A second insulating structure 23b;

[0153] Fourth adapter ring 227; matching ring portion 2271; third step portion 2273;

[0154] A third insulating structure 23c;

[0155] A first insulating bracket 241;

[0156] Electrode component 3; electrode assembly 31; pole tab 311;

[0157] Lamination portion 312; Gathering portion 313;

[0158] Active material coating portion 32;

[0159] Pole ear portion 33; Pole ear end portion 331;

[0160] Conductive portion 4; conductive member 41;

[0161] First connecting section 411; clamping portion 4110; second connecting section 412;

[0162] A first conductive segment 415; a second conductive segment 416; a third conductive segment 417;

[0163] Open slot 42;

[0164] Accommodating groove 5; groove top wall 50;

[0165] First receiving groove 51; base groove 511; first groove 512; second groove 513;

[0166] The second accommodating groove 52 ; the third accommodating groove 53 ; the fourth accommodating groove 54 ; the pressure relief device 6 . DETAILED DESCRIPTION

[0167] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0168] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0169] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0170] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0171] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0172] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0173] The term "plurality" used in the present application refers to more than two, including two.

[0174] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery or a solid-state battery, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, rectangular or in other shapes, etc., and the embodiments of the present application do not limit this.

[0175] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery may include a box for encapsulating one or more battery cells, or one or more battery modules, and the box may prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0176] The battery cell includes a shell component, an electrode component and an electrolyte (in a solid-state battery, it can be a solid electrolyte layer located between the positive and negative electrodes). The electrode component includes at least one electrode assembly. The electrode assembly and the electrolyte are both contained in the shell component. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator (this structure can be omitted in a solid-state battery). The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.

[0177] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0178] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. The material of the isolation film may be PP, polypropylene or PE, polyethylene, etc. The electrode assembly mentioned in the embodiment of the present application is a winding or laminated structure.

[0179] In the battery cells of the related art, during the manufacturing process, the pole ear of the electrode assembly is connected to the pole column to ensure the normal charging and discharging operation. The pole ear is accumulated between the active material coating part and the pole column, occupying a large space. When the size of the shell is fixed, the size of the active material coating part cannot be increased, resulting in the difficulty in improving the energy density of the battery cell. Moreover, when the length of the ear is long, if the space between the active material coating part and the pole column is small, the electrode assembly will have a problem of pole ear redundancy after entering the shell, which may easily lead to a short circuit between the pole ear and the active material coating part, affecting the reliability and stability of the battery cell.

[0180] In view of this, an embodiment of the present application forms a receiving groove connected to the receiving cavity at the pole component, and the receiving groove is set to be open in the direction of the electrode component, and at least partially surrounded by the pole component, and at least part of the conductive part is received in the receiving groove. Thus, by providing a receiving groove to receive the conductive part, the space occupied by the conductive part in the receiving cavity can be reduced, so that the receiving cavity has more space to receive the active material coating part, which is conducive to increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open in the direction of the electrode component, the conductive part can be easily extended into the receiving groove, reducing the difficulty of operation.

[0181] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries including battery cells, and electrical devices using batteries.

[0182] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0183] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0184] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery 100, and the battery 100 can be provided at a position such as the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000.

[0185] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0186] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0187] Please refer to Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application includes a battery cell 102 and a box 101 for accommodating the battery cell 102. The box 101 can be in various structural forms.

[0188] In some embodiments, the box body 101 may include a first box portion 1011 and a second box portion 1012, the first box portion 1011 and the second box portion 1012 cover each other, and the first box portion 1011 and the second box portion 1012 jointly define a storage space for accommodating the battery cell 102. A sealing member may also be provided at the connection position between the first box portion 1011 and the second box portion 1012 to achieve a sealed connection between the first box portion 1011 and the second box portion 1012. For example, referring to Figure 2 , the first box part 1011 and the second box part 1012 can both be hollow structures with one side open, and the open side of the first box part 1011 covers the open side of the second box part 1012, thereby forming a box body 101 with a storage space. For another example, the second box part 1012 can be a hollow structure with one side open, and the first box part 1011 is in the form of a cover and can cover the open side of the second box part 1012. The box body 101 can be in various shapes, such as a cylindrical box body, a rectangular box body, etc.

[0189] In the battery 100, there may be one or more battery cells 102. If there are more than one battery cell 102, the battery cells 102 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 102 are connected in series and in parallel. The battery cells 102 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the battery cells 102 may be accommodated in the box 101; of course, the battery cells 102 may be connected in series, in parallel, or in a mixed connection to form a battery module, and then the battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 101. In some embodiments, the battery cells 102 may be electrically connected through a busbar component to achieve parallel, series, or mixed connection of the battery cells 102.

[0190] Please refer to Figure 3 , Figure 3 The schematic diagram of the structure of the battery cell 102 provided in some embodiments of the present application. The battery cell 102 is in the form of a rectangular parallelepiped, the height direction of the battery cell 102 is the first direction F1, the thickness direction of the battery cell 102 is the second direction F2, the width direction of the battery cell 102 is the third direction F3, and the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other.

[0191] Please refer to Figure 4-Figure 7 , Figure 4 A cross-sectional view of a battery cell 102 provided in some embodiments of the present application, Figure 5 for Figure 4 A partial enlarged view of Figure 6 A top view of a battery cell 102 provided in some embodiments of the present application, Figure 7 For along Figure 6 Section view along line AA.

[0192] Combination Figure 4 The battery cell 102 may include a housing component 1 , a pole component 2 and an electrode component 3 .

[0193] Combination Figure 4 and Figure 5, the pole component 2 is installed on the shell component 1. Exemplarily, the shell component 1 has a accommodating cavity 13, and the shell component 1 includes a first shell wall 111, the first shell wall 111 participates in forming the accommodating cavity 13, and the first shell wall 111 has a mounting hole 112, and the pole component 2 is installed on the first shell wall 111, and is arranged at the mounting hole 112. Among them, "the pole component 2 is installed on the first shell wall 111" means that there is an assembly connection relationship between the pole component 2 and the first shell wall 111, for example, welding or riveting. Therefore, the shell component 1 and the pole component 2 are separate components, and the two are assembled and connected, so that the shell component 1 can be processed separately, and the pole component 2 can be processed separately, so that the processing of the two is convenient, and it is conducive to the processing and manufacturing of the battery cell 102.

[0194] Combination Figure 4 and Figure 5 , the electrode component 3 is accommodated in the shell component 1. Exemplarily, the electrode component 3 includes: an active material coating portion 32 and a pole ear portion 33, the active material coating portion 32 is accommodated in the accommodating cavity 13, and the pole ear portion 33 is connected to the active material coating portion 32. The electrode component 3 includes one or more electrode assemblies 31, and the portion of the current collector coated with the active material layer in the electrode assembly 31 constitutes the active material coating portion 32, and the portion not coated with the active material layer constitutes the pole ear portion 33, and the pole ear portion 33 includes a multilayer pole ear sheet 311.

[0195] The pole component 2 and the first shell wall 111 are located on the same side of the electrode component 3, that is, the pole component 2 is arranged on the side where the first shell wall 111 is located, so that the pole component 2 can be installed at the installation hole 112 of the first shell wall 111. For example, when the first shell wall 111 is located above the electrode component 3, the pole component 2 is also located above the electrode component 3; when the first shell wall 111 is located below the electrode component 3, the pole component 2 is also located below the electrode component 3; when the first shell wall 111 is located on the side of the electrode component 3, the pole component 2 is also located on the same side of the electrode component 3.

[0196] Exemplarily, the housing component 1 may be surrounded by a plurality of walls facing in different directions, one of which is the first housing wall 111, and a plane perpendicular to the penetration direction of the mounting hole 112 is taken as a projection plane, and the orthographic projection of the mounting hole 112 on the projection plane completely falls within the range of the orthographic projection of the first housing wall 111 on the projection plane, and the orthographic projection area of ​​the mounting hole 112 is smaller than the orthographic projection area of ​​the first housing wall 111. One or more mounting holes 112 may be provided on the first housing wall 111 to meet the installation requirements of one or more pole components 2.

[0197] Combination Figure 5 and Figure 7, the electrode component 3 is connected to the pole component 2. The electrode component 3 is connected to the pole component 2 through the conductive part 4. The pole component 2 includes a pole body 21, and the active material coating part 32 is connected to the pole body 21 through the conductive part 4 to form electrical conduction. Exemplarily, the battery 100 includes a busbar component located outside the battery cell 102, and the pole body 21 is connected to the busbar component to form electrical conduction, so that a plurality of battery cells 102 can be connected through the busbar component.

[0198] Exemplarily, when the pole component 2 is a negative pole, the pole body 21 can be a copper-aluminum composite part, wherein the copper-aluminum composite part can include an aluminum part and a copper part, the aluminum part is arranged on the side of the copper part away from the active material coating part 32, and is easy to form a reliable connection with the aluminum runner component, and the copper part is easy to connect with the copper foil material of the negative pole lug; and when the pole component 2 is a positive pole, the pole body 21 can be an aluminum part, the aluminum part is easy to form a reliable connection with the aluminum runner component, and the aluminum part is also easy to connect with the aluminum foil material of the positive pole lug.

[0199] The connection method between the conductive part 4 and the pole component 2 is not limited, for example, it may include, but not limited to, ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, brazing, gluing, etc.

[0200] For example, refer to Figure 5 The conductive part 4 may include a pole ear part 33 and a conductive member 41 connected to the pole ear part 33, and the pole ear part 33 is indirectly connected to the pole body 21 through the conductive member 41. The conductive member 41 may be a part of the electrode component 3, or the conductive member 41 may be a part of the pole component 2, or the conductive member 41 may be independent of the electrode component 3 and the pole component 2.

[0201] Therefore, by indirectly connecting the pole ear portion 33 and the pole body 21 through the conductive member 41, the length of the pole ear portion 33 can be shortened, and the problems of wrinkling, bending and breaking of the pole ear piece 311 can be improved. Moreover, by flexibly designing the shape and material of the conductive member 41, the difficulty of connection with the pole body 21 can be reduced, and the convenience of connection between the conductive member 41 and the pole body 21 can be improved.

[0202] For example, refer to Figure 7 The conductive part 4 includes the pole ear part 33, and is connected to the pole body 21 through the pole ear part 33, that is, the conductive member 41 is not required, and the pole ear part 33 can be directly connected to the pole body 21. Therefore, the use of the conductive member 41 can be omitted, and the connection process of the conductive member 41 and the pole ear part 33 can be omitted.

[0203] An insulating material piece is disposed between the pole body 21 and the first shell wall 111 to achieve insulation between the first shell wall 111 and the pole body 21, thereby preventing the first shell wall 111 from being charged. For example, the insulating material piece may be a part of the pole component 2 (e.g., the first insulating structure 23a, the second insulating structure 23b, or the third insulating structure 23c), or, for another example, the insulating material piece may be disposed between the pole component 2 and the shell component 1.

[0204] The structure of the housing component 1 is not limited. For example, the housing component 1 includes a housing body 11 that participates in forming an accommodating cavity 13, one end of the housing body 11 has an opening 113, and the end of the housing body 11 opposite to the opening 113 is a first housing wall 111, or the housing component 1 includes a housing cover 12 that participates in forming an accommodating cavity 13, and the housing cover 12 is the first housing wall 111. Therefore, the structural design of the housing component 1 is flexible, and the setting position of the pole component 2 is flexible.

[0205] When the shell cover 12 is the first shell wall 111, illustratively, in combination with Figure 6 and Figure 7 The shell component 1 may include a shell body 11 and a shell cover 12, one end of the shell body 11 has an opening 113, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 together form an accommodating cavity 13, and the shell cover 12 serves as a first shell wall 111; or, illustratively, the shell component 1 may include a shell body 11 and two shell covers 12, both ends of the shell body 11 have openings 113, each opening 113 is covered with a shell cover 12, the two shell covers 12 and the shell body 11 together form an accommodating cavity 13, and one of the shell covers 12 serves as the first shell wall 111.

[0206] When the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, illustratively, Figure 4 and Figure 5 The shell component 1 may include a shell body 11 and a shell cover 12, one end of the shell body 11 has an opening 113, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 together form a accommodating cavity 13, and the end of the shell body 11 opposite to the opening 113 serves as a first shell wall 111; or, exemplarily, the shell component 1 may include two shell bodies 11, one end of each shell body 11 has an opening 113, the openings 113 of the two shell bodies 11 are opposite to and cover each other, the two shell bodies 11 together form a accommodating cavity 13, and the end of one shell body 11 opposite to the opening 113 serves as the first shell wall 111.

[0207] In some embodiments of the present application, Figure 4 and Figure 5The shell component 1 includes a shell body 11 that participates in forming an accommodating cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111. It can be understood that the shell body 11 is an integral part, that is, the shell body 11 is an integrally formed part, and includes a first shell wall 111 and a second shell wall 114. The second shell wall 114 surrounds the edge of the first shell wall 111, and the second shell wall 114 extends from the edge of the first shell wall 111 toward one side in the thickness direction of the first shell wall 111. The end of the second shell wall 114 that is away from the first shell wall 111 defines the opening 113, and a cavity is defined between the first shell wall 111 and the second shell wall 114, and the cavity constitutes at least part of the accommodating cavity 13.

[0208] When the shell component 1 includes a shell body 11 with an opening 113 at one end, the shell component 1 also includes a matching shell, which matches the shell body 11 to cover the opening 113 and together with the shell body 11, encloses the accommodating chamber 13. For example, the shell body 11 is an integral piece and is in a semi-closed cylindrical shape, and the matching shell is in a flat plate shape, that is, the matching shell can be a shell cover 12. In this case, the shell component 1 can be a combination of the shell body 11 and the shell cover 12. For another example, the shell body 11 is in a semi-closed cylindrical shape, and the shell component 1 can be a combination of two semi-closed cylindrical openings. As a result, the shell component has various forms and can adapt to a variety of application scenarios.

[0209] In the above technical solution, since the electrode component 3 accommodated in the shell component 1 is connected to the pole component 2 installed on the first shell wall 111, when the battery 100 vibrates or deforms, the pole components 2 connected by the busbar component will be pulled against each other. Since the pole component 2 is arranged on the end wall of the shell body 11 opposite to the opening 113, the force acting on the pole component 2 will be preferentially transmitted to the shell body 11, and will not directly act on the matching shell (such as the shell cover 12). Therefore, not only can the distance for the force to be transmitted to the connection between the shell body 11 and the matching shell (such as the shell cover 12) be extended, but also the shell body 11 will preferentially deform when subjected to force, so as to reduce the force at the connection between the shell body 11 and the matching shell (such as the shell cover 12), thereby effectively reducing the probability of cracking at the connection between the shell body 11 and the matching shell (such as the shell cover 12) during the use of the battery 100, and improving the reliability of the battery cell 102. Furthermore, since the connection position between the shell body 11 and the matching shell (such as the shell cover 12) is not prone to cracking, there is no need to increase the wall thickness of the two in order to increase the connection reliability between the two, which is beneficial to reducing weight and material costs, and is beneficial to miniaturizing the battery cell 102, or improving the energy density of the battery cell 102. The connection method between the shell body 11 and the matching shell is not limited, for example, it can be bonding, welding, etc.

[0210] Exemplarily, when the end wall of the shell body 11 opposite to the opening 113 is used as the first shell wall 111 for mounting the pole component 2, if the pole component 2 is first mounted at the mounting hole 112 of the first shell wall 111, and then the electrode component 3 is installed in the shell body 11, it is difficult to connect the electrode component 3 with the pole component 2. In some embodiments of the present application, the electrode component 3 and the pole component 2 can be connected first, and then the pole component 2 can be assembled and connected to the shell component 1, so that the connection requirements of the electrode component 3 and the pole component 2 can be met, and the connection requirements of the pole component 2 and the shell component 1 can also be met, thereby improving the reliability and processability of the battery cell 102. Moreover, this processing sequence can effectively shorten the length of the conductive part 4. For example, as long as the electrode component 3 and the pole component 2 are connected first, and the pole component 2 and the shell component 1 are connected later, the material and cost of the conductive part 4 can be saved, the redundancy of the conductive part 4 can be reduced, the risk of short circuit can be reduced, and the space occupied by the conductive part 4 in the shell component 1 can be reduced, which is beneficial to improving the energy density of the battery cell 102.

[0211] The material of the housing component 1 is not limited, for example, including but not limited to aluminum shell, steel shell, aluminum-plastic film, plastic or other materials resistant to electrolyte corrosion.

[0212] In some embodiments of this application, please refer to Figure 7 A receiving groove 5 is formed at the pole component 2, and the receiving groove 5 is open toward the direction of the electrode component 3 (that is, toward the direction of the active material coating portion 32, or toward the inside) so that the receiving groove 5 is connected with the receiving cavity 13. At least a portion of the receiving groove 5 is surrounded by the pole component 2, and at least a portion of the conductive portion 4 is received in the receiving groove 5.

[0213] Among them, at least part of the receiving groove 5 is surrounded by the pole component 2, which means that at least part of the groove wall of the receiving groove 5 is composed of the pole component 2. Exemplarily, the receiving groove 5 can be surrounded by only the pole component 2, so that all the groove walls of the receiving groove 5 are composed of the pole component 2. Or, exemplarily, the receiving groove 5 can be surrounded by the pole component 2 and the first shell wall 111, so that the groove walls of the receiving groove 5 are respectively composed of the pole component 2 and the first shell wall 111.

[0214] Thus, by providing the receiving groove 5 to accommodate the conductive part 4, the space occupied by the conductive part 4 in the receiving chamber 13 can be reduced, so that the receiving chamber 13 has a larger space to accommodate the active material coating part 32, which is conducive to increasing the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open toward the direction of the electrode component 3, the conductive part 4 can be easily inserted into the receiving groove 5, reducing the difficulty of operation. In addition, by arranging the first shell wall 111 and the pole component 2 on the same side of the electrode component 3, the installation distance of the pole component 2 can be shortened, and the reliability of the battery cell 102 can be improved.

[0215] In some embodiments of this application, please refer to Figure 7 , the receiving groove 5 is recessed relative to the first shell wall 111 in a direction away from the electrode component 3. In the above technical solution, at least a portion of the receiving groove 5 extends outward beyond the first shell wall 111, thereby further reducing the space occupied by the conductive part 4 in the receiving cavity 13, so that the receiving cavity 13 has a larger space to accommodate the active material coating part 32, which is conducive to increasing the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102.

[0216] Exemplarily, the side surface of the first shell wall 111 facing the electrode component 3 is the shell wall inner end surface 1110, and the receiving groove 5 is recessed in the direction away from the electrode component 3 relative to the shell wall inner end surface 1110. The side groove wall of the receiving groove 5 away from the electrode component 3 (i.e., the side wall surface away from the active material coating portion 32) is the groove top wall 50, and the side surface of the first shell wall 111 facing the electrode component 3 (i.e., the side wall surface facing the active material coating portion 32) is the shell wall inner end surface 1110, and the receiving groove 5 is recessed in the direction away from the electrode component 3 relative to the shell wall inner end surface 1110 (i.e., in the direction away from the active material coating portion 32, i.e., recessed toward the outside), so that the groove top wall 50 of the receiving groove 5 is further away from the electrode component 3 than the shell wall inner end surface 1110.

[0217] In the above technical solution, at least part of the accommodating groove 5 extends outward beyond the plane where the inner end surface 1110 of the shell wall is located, thereby further reducing the space occupied by the conductive part 4 in the accommodating cavity 13, so that the accommodating cavity 13 has a larger space to accommodate the active material coating part 32, which is beneficial to increase the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102.

[0218] In some embodiments of this application, please refer to Figure 7 The pole component 2 includes a pole body 21 connected to the conductive portion 4 , and a surface of the pole body 21 facing the electrode component 3 is an inner end surface 211 of the pole body 21 , and the inner end surface 211 of the pole body 21 participates in forming the accommodating groove 5 .

[0219] In the above technical solution, at least part of the accommodating groove 5 is surrounded by the surface of one side of the pole body 21 facing the electrode component 3, and the conductive part 4 received in the accommodating groove 5 can be easily contacted and connected to the pole body 21, thereby improving the connection convenience and simplifying the structure.

[0220] Exemplarily, the side wall of the receiving groove 5 facing away from the electrode component 3 (i.e., the side wall facing away from the active material coating portion 32) is the groove top wall 50, and the side surface of the pole body 21 facing the electrode component 3 (i.e., the side surface facing the active material coating portion 32) is the inner end surface 211 of the pole body 21, and the inner end surface 211 of the pole body 21 constitutes at least part of the groove top wall 50 of the receiving groove 5. That is, at least part of the inner end surface 211 of the pole body 21 participates in defining the groove top wall 50 of the receiving groove 5, or in other words, the inner end surface 211 of the pole body 21 includes a matching area 211a that participates in defining the groove top wall 50 of the receiving groove 5. The electrode component 3 is connected to the matching area 211a.

[0221] Exemplarily, when at least part of the conductive portion 4 is accommodated in the accommodating groove 5, the pole connecting portion (e.g., the gathered portion 313 of the pole ear portion 33 described herein, or the second connecting segment 412 or the first conductive segment 415 of the conductive member 41) of the conductive portion 4 (e.g., the pole ear portion 33 or the conductive member 41) can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21. During processing, the pole connecting portion of the conductive portion 4 can be first loaded into the accommodating groove 5, and then the pole connecting portion can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21.

[0222] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described herein (such as an ultrasonic weld), or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0223] The configuration of the receiving groove 5 is not limited. For example, the receiving groove 5 may be at least partially surrounded by the pole component 2 alone, or at least partially surrounded by the shell component 1 and the pole component 2 together. The receiving groove 5 may be flexibly designed and constructed.

[0224] Please refer to Figure 8-Figure 14 , Figure 8 A schematic diagram of a pole component provided for some embodiments of the present application; Fig. 9 for Figure 8 A top view of the pole component shown in ; Fig.10 For along Fig. 9 The view from direction B shown in FIG. Fig.11 For along Fig. 9 Sectional view of the mid-CC line; Fig.12 To adopt Fig.11 A front view of a battery cell with a pole component shown in FIG. Fig.13 for Fig.12 A top view of a battery cell shown in ; Fig.14 for Fig.12 A side view of a battery cell is shown in FIG.

[0225] Please refer again Figure 8-Figure 14 In some embodiments of the present application, the pole component 2 includes a pole body 21, a first adapter structure 22a and a first insulating structure 23a, the first adapter structure 22a surrounds the pole body 21 and is connected to the first shell wall 111, the first insulating structure 23a is insulated and sealed between the first adapter structure 22a and the pole body 21, the conductive portion 4 is connected to the pole body 21, and the accommodating groove 5 includes a first accommodating groove 51 surrounded by the pole component 2.

[0226] The first adapter structure 22a surrounds the entire circumference of the pole body 21 along the circumference of the mounting hole 112, so that the first adapter structure 22a can play a role in connecting the pole body 21 and the first shell wall 111 in the outer peripheral area of ​​the pole body 21. The first insulating structure 23a insulates the first adapter structure 22a from the pole body 21, and makes the matching position of the first adapter structure 22a and the pole body 21 present a sealed state, so as to isolate the inside and outside of the shell component 1 after the first adapter structure 22a is connected to the first shell wall 111, reduce the risk of the electrolyte in the shell component 1 leaking from the matching position of the first adapter structure 22a and the pole body 21 to the outside of the shell component 1, and reduce the risk of liquid or dust outside the shell component 1 entering the shell component 1 from the matching position of the first adapter structure 22a and the pole body 21, thereby improving the reliability of the battery cell 102. Among them, the connection method of the first adapter structure 22a and the first shell wall 111 is not limited, for example, it can be welding, riveting, punching, bonding, etc.

[0227] In the above technical solution, since the pole component 2 includes not only the pole body 21 but also the first adapter structure 22a connected to the first shell wall 111, and the first insulating structure 23a for insulation and sealing is arranged between the first adapter structure 22a and the pole body 21, when the pole component 2 is installed on the first shell wall 111 and the first adapter structure 22a is connected to the first shell wall 111, no seal or the like is required between the first adapter structure 22a and the first shell wall 111, and no large sealing pressure is required to meet the compression degree of the seal at that location, so that the force on the first shell wall 111 can be reduced, and the shell component 1 can be protected, which is conducive to reducing the wall thickness of the shell component 1 and reducing the material cost. In addition, when the first shell wall 111 is the end of the shell body 11 opposite to the opening 113, the force on the connection between the first shell wall 111 and the second shell wall 114 can be reduced, and the force on the second shell wall 114 can be reduced, which is conducive to ensuring the reliability of the shell body 11 and reducing the wall thickness and cost of the shell body 11. Furthermore, the first receiving groove 51 is surrounded by the pole component 2 in this structural form, which facilitates the flexible processing of the first receiving groove 51 and the easy design of the shape and volume of the first receiving groove 51 .

[0228] Exemplarily, the pole component 2 can be tested for air tightness when it is received or when the pole component 2 is processed to determine whether a reliable seal is formed at the connection position between the first adapter structure 22a and the pole body 21. If the seal is reliable, the first adapter structure 22a can be connected to the first shell wall 111.

[0229] The shapes of the first adapter structure 22 a and the pole body 21 are not limited, for example, any one of them can be processed into a circle, an ellipse, a rectangle, a rectangle with R corners, etc.

[0230] In some embodiments of the present application, the outer contour of the orthographic projection of the first accommodating groove 51 on the first shell wall 111 (equivalent to the orthographic projection of the first accommodating groove 51 onto the projection plane perpendicular to the wall thickness direction of the first shell wall 111) is located outside the outer contour of the orthographic projection of the pole body 21 on the first shell wall 111 (equivalent to the orthographic projection of the pole body 21 onto the projection plane perpendicular to the wall thickness direction of the first shell wall 111).

[0231] Therefore, by setting the orthographic projection of the pole body 21 on the first wall 111 to fall within the outer contour of the orthographic projection of the first accommodating groove on the first wall, the range of the first accommodating groove 51 is larger, which is conducive to accommodating the conductive part 4 to a greater extent and facilitating the connection between the conductive part 4 and the pole body 21.

[0232] Please combine again Figure 8-Figure 14Exemplarily, the first receiving groove 51 is formed on the side of the pole body 21 and the first transition structure 22a facing the electrode component 3 (ie, the side facing the active material coating portion 32).

[0233] Therefore, since the first receiving groove 51 includes both a portion formed on the inner side of the pole body 21 (i.e., the side close to the active material coating portion 32) and a portion formed on the inner side of the first adapter structure 22 (i.e., the side close to the active material coating portion 32), the orthographic projection of the pole body 21 on the first wall 111 can fall within the outer contour of the orthographic projection of the first receiving groove 51 on the first wall 111, making the processing of the first receiving groove 51 convenient and easy.

[0234] Please combine again Figure 8-Figure 14 For example, the first adapter structure 22 a bulges relative to the first shell wall 111 in a direction away from the electrode component 3 , so that the first receiving groove 51 is recessed relative to the first shell wall 111 in a direction away from the electrode component 3 .

[0235] Therefore, by processing the first adapter structure 22a into a protruding bulge, a part of the first accommodating groove 51 is formed on the side of the pole body 21 facing the electrode component 3, and another part of the first accommodating groove 51 is formed on the side of the first adapter structure 22a facing the electrode component 3, and the first accommodating groove 51 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3, so that the side of the pole body 21 facing the electrode component 3 and the side of the first adapter structure 22a facing the electrode component 3 both have space to accommodate the conductive part 4, which not only facilitates the accommodation of the conductive part 4 to a greater extent, but also facilitates the design of a variety of forms of the conductive part 4.

[0236] Exemplarily, the inner end surface 211 of the pole body 21 (i.e., the side surface of the pole body 21 facing the electrode component 3) and the inner end surface 220 of the first adapter structure 22a (i.e., the side surface of the first adapter structure 22a facing the electrode component 3) together enclose the first receiving groove 51. That is, the inner end surface 211 of the pole body 21 can constitute a part of the groove wall of the receiving groove 5, and the inner end surface 220 of the first adapter structure 22a also constitutes the rest of the groove wall of the first receiving groove 51. In this way, the first receiving groove 51 can be relatively simply enclosed, and the inner end surface 211 of the pole body 21 can constitute a partial groove wall of the first receiving groove 51, so that the conductive part 4 received in the first receiving groove 51 can be easily contacted and connected to the pole body 21, thereby improving the connection convenience and simplifying the structure. Alternatively, illustratively, the first receiving groove 51 may also be surrounded by the inner end surface 211 of the pole body 21 , the inner end surface 220 of the first transition structure 22 a , and the first insulating structure 23 a .

[0237] Please combine again Figure 8-Figure 14 The first adapter structure 22a is configured to be a shape that bulges relative to the first shell wall 111 in a direction away from the electrode component 3, so that the first adapter structure 22a surrounds a base groove 511 that is recessed in a direction away from the electrode component 3, and the first receiving groove 51 includes the base groove 511. It is worth noting that since the first adapter structure 22a needs to surround the pole body 21, the first adapter structure 22a has a central annular hole, and the portion of the base groove 511 opposite to the central annular hole may be partially occupied by the pole body 21, or may not be occupied by the pole body 21.

[0238] For example, please refer to Fig.11 , the inner end face 211 of the pole body 21 and the groove wall surrounding the base groove 511 together form the first receiving groove 51. Thus, the first receiving groove 51 can be relatively simply enclosed, and the inner end face 211 of the pole body 21 can constitute a part of the groove top wall 50 of the receiving groove 5, so that the conductive part 4 received in the receiving groove 5 can be easily contacted and connected to the pole body 21, thereby improving the connection convenience and simplifying the structure. Alternatively, illustratively, the first receiving groove 51 can also be enclosed by the inner end face 211 of the pole body 21, the groove wall surrounding the base groove 511, and the first insulating structure 23a.

[0239] Please combine again Figure 9-Figure 14 Exemplarily, the first adapter structure 22a includes a first adapter ring 221 and a second adapter ring 222, the second adapter ring 222 is arranged on the side of the first adapter ring 221 away from the electrode component 3 (i.e., the side away from the active material coating portion 32, or the outer side), the outer ring of the first adapter ring 221 is connected to the first shell wall 111, and the inner ring of the first adapter ring 221 and the inner ring of the second adapter ring 222 clamp the pole body 21 together through the first insulating structure 23a to limit the relative axial movement between the pole body 21 and the first adapter structure 22a. For example, the first adapter ring 221 and the second adapter ring 222 can be welded, riveted, punched, or bonded. For example, the outer ring of the first adapter ring 221 is welded, riveted, punched, or bonded to the first shell wall 111.

[0240] Therefore, the first adapter structure 22a includes a first adapter ring 221 and a second adapter ring 222 which are arranged inside and outside and assembled and connected, thereby facilitating the assembly and connection of the first adapter structure 22a with the first insulating structure 23a and the pole body 21, making the pole component 2 easy to process and manufacture.

[0241] Exemplarily, the first adapter ring 221 and the second adapter ring 222 are both made of aluminum and are welded together, and the first adapter ring 221 and the first shell wall 111 are both made of aluminum and are welded together, which is beneficial to improving the welding yield.

[0242] Combination Figure 11-Figure 14In some embodiments of the present application, the first receiving groove 51 is formed on the side of the first adapter ring 221 and the pole body 21 facing the electrode component 3, and the first adapter ring 221 is raised relative to the first shell wall 111 in a direction away from the electrode component 3, so that the first receiving groove 51 is recessed relative to the first shell wall 111 in a direction away from the electrode component 3, and the second adapter ring 222 is connected to the raised portion of the first adapter ring 221. Thus, by connecting the outer ring of the first adapter ring 221 to the first shell wall 111 and the second adapter ring 222 to the raised portion of the first adapter ring 221, the position where the second adapter ring 222 is connected to the first adapter ring 221 (for example Fig.11 The first position P1 in the figure is connected to the first adapter ring 221 and the first shell wall 111 (for example Fig.11 The second position P2 in the two spatial dimensions (e.g. Fig.11 There is a distance between the two positions (in the horizontal direction and the vertical direction shown in ), thereby reducing the mutual thermal influence when the two positions are welded separately, and improving the connection reliability between the second adapter ring 222 and the first adapter ring 221, as well as the connection reliability between the first adapter ring 221 and the first shell wall 111.

[0243] Combination Figure 11-Figure 14 Exemplarily, the first adapter ring 221 includes a first step portion 2211 that surrounds the pole body 21 and protrudes relative to the first shell wall 111 in a direction away from the electrode component 3, the first step portion 2211 forms a raised portion of the first adapter ring 221, the second adapter ring 222 is connected to the first step portion 2211, and a base groove 511 is formed on a side of the first step portion 2211 facing the electrode component 3 (i.e., a side facing the active material coating portion 32, or the inner side). Exemplarily, when the first adapter structure 22a only includes the first adapter ring 221 and the second adapter ring 222 (the surface of the first adapter ring 221 may have an insulating layer, or may not have one), the inner end face of the first adapter ring 221 constitutes the inner end face 220 of the first adapter structure 22a, so as to participate in forming the first receiving groove 51; and when the first adapter structure 22a also includes a first insulating bracket 241 installed on the inner side of the first adapter ring 221 (i.e., the side close to the active material coating portion 32), the inner end face of the first insulating bracket 241 constitutes the inner end face 220 of the first adapter structure 22a, so as to participate in forming the first receiving groove 51.

[0244] When the first adapter structure 22a includes the first adapter ring 221 and the second adapter ring 222, the form of the first insulating structure 23a that performs the insulation and sealing functions is not limited. Fig.11The pole body 21 includes a peripheral portion 212, which is the outer peripheral structure of the pole body 21. The first insulating structure 23a includes a sealing structure 231 and a first insulating member 232. The sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated and fixedly matched with the pole body 21 through the first insulating member 232.

[0245] Therefore, since the first insulating structure 23a includes the first insulating member 232 and the sealing structure 231 which are not integrated into one piece, the design and processing of the first insulating structure 23a can be simplified, so that the processing of the pole part 2 is easy, and the reliable connection and insulation matching between the first adapter structure 22a and the pole body 21 can be achieved. Moreover, according to the specific matching requirements with the pole body 21 and the first adapter structure 22a, the first insulating member 232 can be set as an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the first insulating member 232 can be set as a compressible sealing member (such as an elastic rubber member) with a sealing effect, so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure 231 and improve the sealing effect.

[0246] Exemplarily, the sealing structure 231 is an integrally formed part, so that it is easy to process and manufacture, and when the sealing structure 231 includes multiple parts, the connection of the multiple parts is more reliable.

[0247] For example, in combination Fig.11 , the first insulating member 232 and the pole body 21, and the first insulating member 232 and the second adapter ring 222 can be connected by injection molding respectively. For example, when processing the pole component 2, the pole body 21 and the second adapter ring 222 can be connected by injection molding together, and then the sealing structure 231 and the first adapter ring 221 are assembled, and then the first adapter ring 221 and the second adapter ring 222 are connected, and the sealing structure 231 is pressed. In this way, the pole body 21 and the second adapter ring 222 can be insulated and fixedly matched through the first insulating member 232.

[0248] Or, illustratively, in combination Fig.15 , Fig.15The cross-sectional view of the pole component provided in some embodiments of the present application, the second adapter ring 222 may include a stop ring portion 2221, and the first insulating member 232 is sandwiched between the stop ring portion 2221 and the peripheral portion 212. In this embodiment, the material of the first insulating member 232 is not limited, for example, it can be a plastic member or an elastic rubber member. Therefore, by setting the second adapter ring 222 to be connected to the first adapter ring 221, the stop ring portion 2221 of the second adapter ring 222 and the peripheral portion 212 are used to clamp the first insulating member 232, so that the injection molding process can be omitted.

[0249] Or, illustratively, in combination Fig.16 , Fig.16 A cross-sectional view of a pole component provided for some embodiments of the present application; the first insulating structure 23a includes an integrally formed sealing structure 231, a portion of the sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212, and a portion of the sealing structure 231 is clamped between the second adapter ring 222 and the peripheral portion 212, the first insulating structure 23a has both sealing and insulating properties, thereby simplifying the processing of the first insulating structure 23a.

[0250] In the above technical solution, when the pole body 21 includes the peripheral portion 212, and the first adapter structure 22a clamps the peripheral portion 212 through the first insulating structure 23a, at least part of the sealing structure 231 can be clamped on the side of the peripheral portion 212 facing the electrode component 3. Thus, the sealing can be performed from the side of the peripheral portion 212 close to the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking from the matching position of the pole body 21 and the first adapter structure 22a, thereby improving the sealing effect.

[0251] Please refer to Fig.17 and Fig.18 , Fig.17 A cross-sectional view of a pole component provided in some embodiments of the present application, Fig.18 This is a cross-sectional view of a pole component provided in some embodiments of the present application. The first adapter structure 22a may also be configured to not include the first adapter ring 221 and the second adapter ring 222 that are assembled and connected.

[0252] For example, in some embodiments of the present application, reference Fig.17 and Fig.18The first adapter structure 22a includes a third adapter ring 223, the outer ring of the third adapter ring 223 is connected to the first shell wall 111, and the third adapter ring 223 includes an integrally arranged first extension portion 2231 and a second extension portion 2232, that is, the first extension portion 2231 and the second extension portion 2232 are different parts of an integral piece, rather than two separate parts assembled and connected. Among them, the connection method between the third adapter ring 223 and the first shell wall 111 is not limited, for example, welding, riveting, punching, bonding, etc. The second extension portion 2232 is connected to the side of the first extension portion 2231 away from the electrode component 3 (that is, the side away from the active material coating portion 32, or the outer side), and the first extension portion 2231 and the second extension portion 2232 jointly clamp the pole body 21 through the first insulating structure 23a to limit the relative axial movement between the pole body 21 and the first adapter structure 22a.

[0253] Therefore, since the third adapter ring 223 includes the first extension portion 2231 and the second extension portion 2232 which are integrally arranged, the first extension portion 2231 and the second extension portion 2232 are integrated into the same structural component, thereby eliminating the process of connecting the first extension portion 2231 and the second extension portion 2232, reducing the use of parts, and the first extension portion 2231 and the second extension portion 2232 are not easy to separate, which can improve the clamping reliability of the pole body 21 by the first insulating structure 23a.

[0254] Exemplarily, the third adapter ring 223 and the first shell wall 111 are both made of aluminum and are welded together, which is beneficial to improving the welding yield.

[0255] In some embodiments of the present application, reference Fig.17 and Fig.18 The first accommodating groove 51 is formed on the side of the third adapter ring 223 and the pole body 21 facing the electrode component 3. The third adapter ring 223 bulges relative to the first shell wall 111 in the direction away from the electrode component 3, so that the first accommodating groove 51 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3.

[0256] For example, reference Fig.17 and Fig.18The third adapter ring 223 includes a second step portion 2232 surrounding the pole body 21 and protruding relative to the first shell wall 111 in a direction away from the electrode component 3, the second step portion 2232 forms a raised portion of the third adapter ring 223, and the base groove 511 is formed on a side of the second step portion 2232 facing the electrode component 3. Exemplarily, when the first adapter structure 22a only includes the third adapter ring 223 (for example, the surface of the third adapter ring 223 may have an insulating layer, or may not have one), the inner end surface of the third adapter ring 223 constitutes the inner end surface 220 of the first adapter structure 22a to participate in forming the first receiving groove 51; and when the first adapter structure 22a also includes a second insulating bracket installed on the inner side of the third adapter ring 223 (i.e., the side close to the active material coating portion 32), the inner end surface of the second insulating bracket constitutes the inner end surface 220 of the first adapter structure 22a to participate in forming the first receiving groove 51.

[0257] When the first adapter structure 22a includes the third adapter ring 223, the form of the first insulating structure 23a that performs the insulation and sealing functions is not limited. Fig.17 The pole body 21 includes a peripheral portion 212, which is the outer peripheral structure of the pole body 21. The first insulating structure 23a includes a sealing structure 231 and a first insulating member 232. The sealing structure 231 is clamped between the first extension portion 2231 and the peripheral portion 212, and the first insulating member 232 is clamped between the second extension portion 2232 and the peripheral portion 212.

[0258] Therefore, since the first insulating structure 23a includes the first insulating member 232 and the sealing structure 231 which are not integrated into one piece, the design and processing of the first insulating structure 23a can be simplified, so that the processing of the pole part 2 is easy, and the reliable connection and insulation matching between the first adapter structure 22a and the pole body 21 can be achieved. Moreover, according to the specific matching requirements with the pole body 21 and the first adapter structure 22a, the first insulating member 232 can be set as an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the first insulating member 232 can be set as a compressible sealing member (such as an elastic rubber member) with a sealing effect, so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure 231 and improve the sealing effect.

[0259] For example, in combination Fig.18The first insulating structure 23a includes an integrally formed sealing structure 231, a portion of the sealing structure 231 is clamped between the first extension portion 2231 and the peripheral portion 212, and a portion of the sealing structure 231 is clamped between the second extension portion 2232 and the peripheral portion 212. The first insulating structure 23a has both sealing and insulating properties, thereby simplifying the processing of the first insulating structure 23a.

[0260] In the above technical solution, when the pole body 21 includes the peripheral portion 212, and the first adapter structure 22a clamps the peripheral portion 212 through the first insulating structure 23a, at least part of the sealing structure 231 can be clamped on the side of the peripheral portion 212 facing the electrode component 3. Thus, the sealing can be performed from the side of the peripheral portion 212 close to the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking from the matching position of the pole body 21 and the first adapter structure 22a, thereby improving the sealing effect.

[0261] It is worth noting that the shape and processing method of the third adapter ring 223 are not limited. For example, it can be processed by stamping, thinning, stretching, bending and other processes. For example, it can be processed into, but not limited to Fig.17 or Fig.18 The form shown.

[0262] In some embodiments of the present application, Fig.19 and Fig. 20 , the first adapter structure 22a includes a fourth adapter ring 227, the fourth adapter ring 227 includes a matching ring portion 2271, the pole body 21 is passed through the matching ring portion 2271 and is clamped on both the inner and outer sides of the matching ring portion 2271 by the first insulating structure 23a; that is, the side of the matching ring portion 2271 facing the active material coating portion 32 and the side away from the active material coating portion 32 are both clamped with the first insulating structure 23a. Among them, the connection method between the fourth adapter ring 227 and the first shell wall 111 is not limited, for example, it can be welded, riveted, punched, bonded, etc. In the above technical solution, the fourth adapter ring 227 is clamped by the pole body 21, so that the structure of the pole component 2 is simple and easy to process, and the relative fixation and insulation matching of the pole body 21 and the first adapter structure 22a can be simply and effectively achieved.

[0263] Exemplarily, the fourth adapter ring 227 and the first shell wall 111 are both made of aluminum and are welded together, which is beneficial to improving the welding yield.

[0264] In some embodiments of the present application, reference Fig.19 and Fig. 20The first accommodating groove 51 is formed on the side of the fourth adapter ring 227 and the pole body 21 facing the electrode component 3. The fourth adapter ring 227 bulges relative to the first shell wall 111 in the direction away from the electrode component 3, so that the first accommodating groove 51 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3.

[0265] Combination Fig.19 and Fig. 20 The fourth adapter ring 227 includes a third step portion 2273 surrounding the pole body 21 and protruding relative to the first shell wall 111 in a direction away from the electrode component 3. The third step portion 2273 forms a raised portion of the fourth adapter ring 227. The base groove 511 is formed on the side of the third step portion 2273 facing the electrode component 3 (i.e., the side facing the active material coating portion 32, or facing the inside). The third step portion 2273 is arranged around the matching ring portion 2271, and the third step portion 2273 and the matching ring portion 2271 can be flush (for example Fig.19 as shown), or it may not be level (e.g. Fig. 20 shown).

[0266] Exemplarily, when the first adapter structure 22a only includes the fourth adapter ring 227 (for example, the surface of the fourth adapter ring 227 may have an insulating layer, or may not have one), the inner end surface of the fourth adapter ring 227 constitutes the inner end surface 220 of the first adapter structure 22a to participate in forming the first receiving groove 51; and when the first adapter structure 22a also includes a third insulating bracket installed on the inner side of the fourth adapter ring 227 (i.e., the side close to the active material coating portion 32), the inner end surface of the third insulating bracket constitutes the inner end surface 220 of the first adapter structure 22a to participate in forming the first receiving groove 51.

[0267] For example, in combination Fig.19 and Fig. 20 The pole body 21 may include a penetration portion 214 that penetrates the matching ring portion 2271, and an inner stop portion 215 and an outer stop portion 216 that are connected to the penetration portion 214 and clamped on both sides of the matching ring portion 2271; the inner stop portion 215 is clamped on the inner side of the matching ring portion 2271 (i.e., the side facing the active material coating portion 32), and the outer stop portion 216 is clamped on the outer side of the matching ring portion 2271 (i.e., the side away from the active material coating portion 32). The first insulating structure 23a includes a sealing structure 231, at least part of which is clamped between the matching ring portion 2271 and the inner stop portion 215.

[0268] Thus, the sealing structure 231 is clamped by the matching position of the pole body 21 and the matching ring portion 2271, so that the sealing structure 231 can be in the matching position of the first adapter structure 22a and the pole body 21, which is conducive to sealing the matching position of the first adapter structure 22a and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the matching ring portion 2271 and the inner limit portion 215, it can be sealed from the side of the matching ring portion 2271 close to the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking out of the matching position of the pole body 21 and the first adapter structure 22a, thereby improving the sealing effect.

[0269] It is worth noting that when the pole body 21 includes a penetration portion 214 penetrated through the mating ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetration portion 214 and clamped on the inner and outer sides of the mating ring portion 2271, the composition of the first insulating structure 23a is not limited, and can be an integral part or a split component.

[0270] For example, in combination Fig.19 The first insulating structure 23a includes an integrally formed sealing structure 231, the sealing structure 231 surrounds the matching ring portion 2271, and is clamped between the matching ring portion 2271 and the inner limit portion 215, and between the matching ring portion 2271 and the outer limit portion 216. That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties. Therefore, since the sealing structure 231 is an integral structure and surrounds the matching ring portion 2271, it is possible to reduce parts and assembly processes.

[0271] For example, in combination Fig. 20, the first insulating structure 23a includes a second insulating member 234 and a sealing structure 231. The second insulating member 234 is clamped between the outer limit portion 216 and the matching ring portion 2271, and the sealing structure 231 is clamped between the inner limit portion 215 and the matching ring portion 2271. Therefore, since the first insulating structure 23a includes the second insulating member 234 and the sealing structure 231 which are not integrated into one piece, the design and processing of the first insulating structure 23a can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the first adapter structure 22a, the second insulating member 234 can be set as an insulating member (such as a plastic member) that is basically incompressible and does not have a sealing effect, or the second insulating member 234 can be set as a compressible sealing member (such as an elastic rubber member) with a sealing effect, so as to meet different actual requirements. In addition, when the second insulating member 234 is an insulating member (such as a plastic member) that is basically incompressible and does not have a sealing effect, it is easy to control the compression amount of the sealing structure 231 and improve the sealing effect.

[0272] It is worth noting that when the pole body 21 includes a penetration portion 214 that penetrates the matching ring portion 2271, and an inner stop portion 215 and an outer stop portion 216 that are connected to the penetration portion 214 and clamped on both sides of the matching ring portion 2271, the shape and processing method of the pole body 21 are not limited. For example, it can be processed by split welding or riveting, for example, it can be processed into, but not limited to, Fig.19 or Fig. 20 The form shown.

[0273] For example, in combination Fig.19 During assembly, the connection method between the penetration portion 214 and the inner limiting portion 215 is not limited. It can be an integral part, or it can be a split part and pre-connected together. The end of the penetration portion 214 facing away from the inner limiting portion 215 can have a rivet portion 2141. When assembling the pole body 21 to the fourth adapter ring 227, the penetration portion 214 can be penetrated along the direction from the inner limiting portion 215 to the outer limiting portion 216 through the matching ring portion 2271 equipped with the first insulating structure 23a (such as a sealing structure 231 surrounding the matching ring portion 2271, or a second insulating member 234 and a sealing structure 231), and then the rivet portion 2141 is riveted to limit the penetration portion 214 from coming out along the direction from the outer limiting portion 216 to the inner limiting portion 215. After that, the rivet portion 2141 and the outer limiting portion 216 can be welded, thereby facilitating the connection of the penetration portion 214 and the outer limiting portion 216, such as welding. Alternatively, the riveting portion 2141 may be omitted, and the riveting process after the penetration portion 214 is penetrated may be omitted.

[0274] For example, in combination Fig. 20The penetration portion 214, the inner limiting portion 215 and the outer limiting portion 216 are an integrated part. When assembling the pole body 21 to the fourth adapter ring 227, the penetration portion 214 can be first penetrated through the matching ring portion 2271 equipped with the sealing structure 231 along the direction from the inner limiting portion 215 to the outer limiting portion 216, and then the second insulating member 234 can be assembled (or the second insulating member 234 can be first assembled to the matching ring portion 2271 and then the penetration portion 214 is penetrated), and then the outer limiting portion 216 is riveted, so that the outer limiting portion 216 presses the second insulating member 234 against the matching ring portion 2271, thereby easily controlling the compression amount of the sealing structure 231.

[0275] In some embodiments of this application, please refer to Fig.11 The inner end surface 211 of the pole body 21 and the inner end surface 220 of the first adapter structure 22a both participate in forming the first receiving groove 51. The position of the inner end surface 220 of the first adapter structure 22a adjacent to the pole body 21 is the surrounding area 2201 surrounding the pole body 21, that is, the circle of the inner end surface 220 of the first adapter structure 22a closest to the pole body 21 is the surrounding area 2201, and the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21. Among them, the "inner end surface 211 of the pole body 21" refers to: the side surface of the pole body 21 facing the electrode component 3 (that is, facing the active material coating part 32), and the "inner end surface 220 of the first adapter structure 22a" refers to: the side surface of the first adapter structure 22a facing the electrode component 3 (that is, facing the active material coating part 32). Among them, the inner end surface 220 of the first adapter structure 22a can be a planar structure or a non-planar structure.

[0276] At this time, when the inner end surface 211 of the pole body 21 is small (for example, the first adapter structure 22a is set to be a long strip (for example, a rectangle, an ellipse, a racetrack, etc.) extending along the length direction of the first shell wall 111), the pole body 21 is set in the center of the first adapter structure 22a and the outline is circular, for example, Fig. 9 ), a part of the pole connection part of the conductive part 4 (such as the folded part 313 of the pole ear part 33 described herein, or the second connection section 412 or the first conductive section 415 of the conductive member 41) can be laid flat on the inner end surface 211 of the pole body 21, and the rest can be laid flat on the surrounding area 2201 (for example, the pole connection part is also in the shape of a long strip), so that the pole connection part of the conductive part 4 can be supported as a whole, which is convenient for the pressing of the welding nozzle, so that the conductive part 4 can be reliably connected to the pole body 21. "Runway shape" is an oblong circle, in which the oblong circle can be roughly considered to be composed of a rectangle and two semicircles, and the outline shape of the oblong circle can be roughly considered to be the outline shape of the rectangle after the two short sides of the rectangle are replaced by two arcs.

[0277] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described herein (such as an ultrasonic weld), or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0278] In addition, when the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, the inner end surface 211 of the pole body 21 can also be set to be larger (for example, the first adapter structure 22a is formed into a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the first adapter structure 22a, for example, refer to Figure 6 ).

[0279] In addition, when the first adapter structure 22a is formed into a long strip (such as a rectangle, an ellipse, a racetrack, etc.) extending along the length direction of the first shell wall 111, the pole body 21 is arranged at the length center of the adapter structure 22 and is circular. As a result, the connection position of the first adapter structure 22a and the pole body 21 is subjected to uniform force, and the compression amount of the first insulating structure 23a is easily controlled to improve the reliability of the sealing cooperation between the two, and the sealing area is relatively small and not easy to fail.

[0280] Alternatively, in some embodiments of the present application, please refer to Fig.16 The inner end surface 211 of the pole body 21 and the inner end surface 220 of the first adapter structure 22a both participate in forming the first receiving groove 51. The position of the inner end surface 220 of the first adapter structure 22a adjacent to the pole body 21 is the surrounding area 2201 surrounding the pole body 21, that is, the circle of the inner end surface 220 of the first adapter structure 22a closest to the pole body 21 is the surrounding area 2201, and the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction of the electrode component 3 (that is, in the direction of the active material coating portion 32). Among them, the "inner end surface 211 of the pole body 21" refers to: the side surface of the pole body 21 facing the electrode component 3 (that is, facing the active material coating portion 32), and the "inner end surface 220 of the first adapter structure 22a" refers to: the side surface of the first adapter structure 22a facing the electrode component 3 (that is, facing the active material coating portion 32). The inner end surface 220 of the first adapter structure 22a may be a planar structure or a non-planar structure.

[0281] Here, “the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the electrode component 3” means that the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the active material coating portion 32. In short, the inner end surface 211 of the pole body 21 protrudes inwardly from the surrounding area 2201 of the inner end surface 220 of the first adapter structure 22a.

[0282] Thus, by setting the inner end surface 211 of the pole body 21 to protrude from the surrounding area 2201 toward the direction of the electrode component 3, when the height of the pole body 21 is constant, the pole body 21 can be retracted in the direction of the accommodating cavity 13, so as to reduce the space occupied by the pole component 2 outside the shell component 1, and reduce the battery cell 102 in the direction of setting the pole component 2 (for example Figure 3 The dimension in the first direction F1) shown in FIG.

[0283] In some embodiments of the present application, Fig.16 When the inner end surface 211 of the pole body 21 protrudes out of the surrounding area 2201 toward the electrode component 3, the Figure 6 If the first adapter structure 22a is set to be a long strip (e.g., rectangular, elliptical, racetrack, etc.) extending along the length direction of the first shell wall 111, the contour shape of the pole body 21 matches the contour shape of the first adapter structure 22a (e.g., rectangular, elliptical, racetrack, etc.). In this way, the inner end face 211 of the pole body 21 is relatively large, which is conducive to laying the pole connection part of the conductive part 4 (e.g., the retracted part 313 of the pole ear part 33 described in this article, or the second connection section 412 or the first conductive section 415 of the conductive member 41) flat on the inner end face 211 of the pole body 21 (e.g., the pole connection part is also a long strip), which is conducive to increasing the connection area between the conductive part 4 and the pole body 21, thereby improving the charging performance.

[0284] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described herein (such as an ultrasonic weld), or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0285] In some embodiments of the present application, when the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the electrode component 3, Figure 8 If the first adapter structure 22a is set to be a long strip extending along the length direction of the first shell wall 111, the pole body 21 is set in the center of the first adapter structure 22a and has a circular outline, so that the inner end surface 211 of the pole body 21 is relatively small. For example, Fig.18The conductive portion 4 is configured to include a pole ear portion 33 and a conductive member 41 connected to the pole ear portion 33, the conductive member 41 includes a first conductive segment 415 laid on the inner end surface 211 of the pole body 21, and a second conductive segment 416 staggered from the inner end surface 211 of the pole body 21, the second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the electrode component 3 (i.e., toward the outside, or in a direction away from the active material coating portion 32), and the pole ear portion 33 is connected to the second conductive segment 416.

[0286] Thus, the height difference between the inner end surface 211 of the pole body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 416 and the pole ear portion 33 of the conductive member 41, so that the space can be fully utilized, the space occupied by the conductive portion 4 in the accommodating cavity 13 can be reduced, and the energy density of the battery cell 102 can be improved. Exemplarily, if the portion where the pole ear portion 33 connects with the second conductive segment 416 (such as the gathered portion 313 described herein) is in the shape of a long strip, the second conductive segment 416 can also be set to a long strip, and the first conductive segment 415 can be set to a circular shape that matches the shape of the pole body 21, which can meet the connection requirements.

[0287] When the conductive member 41 includes a first conductive segment 415 and a second conductive segment 416 , in order to ensure that the second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the electrode component 3 , the conductive member 41 may be made of a material with a certain hardness and thickness, for example, the conductive member 41 may be a metal sheet.

[0288] In addition, when the first adapter structure 22a is formed into a long strip (such as a rectangle, an ellipse, a racetrack, etc.) extending along the length direction of the first shell wall 111, the pole body 21 is arranged at the length center of the adapter structure 22 and is circular. As a result, the connection position of the first adapter structure 22a and the pole body 21 is subjected to uniform force, and the compression amount of the first insulating structure 23a is easily controlled to improve the reliability of the sealing cooperation between the two, and the sealing area is relatively small and not easy to fail.

[0289] In addition, according to the different shapes of the receiving groove 5 , the second conductive segment 416 can be accommodated in the receiving groove 5 , or the second conductive segment 416 can be arranged outside the receiving groove 5 .

[0290] In some embodiments of the present application, the outer contour of the orthographic projection of the first accommodating groove 51 on the first shell wall 111 (equivalent to the orthographic projection of the first accommodating groove 51 onto the projection plane perpendicular to the wall thickness direction of the first shell wall 111) is located within the outer contour range of the orthographic projection of the pole body 21 on the first shell wall 111 (equivalent to the orthographic projection of the pole body 21 onto the projection plane perpendicular to the wall thickness direction of the first shell wall 111).

[0291] In the above technical solution, it is helpful to meet the requirement that the range of the first accommodating groove 51 is smaller than that of the pole body 21 .

[0292] Combination Fig.21 and Fig. 22 , Fig.21 A partial cross-sectional view of a battery cell provided for some embodiments of the present application; Fig. 22 A partial cross-sectional view of a battery cell provided for some embodiments of the present application; in some embodiments of the present application, the first adapter structure 22a includes a surrounding portion 22a1 located on a side of the pole body 21 close to the electrode component 3, the surrounding portion 22a1 surrounds the avoidance hole 22a2, the pole body 21 is covered on the side of the avoidance hole 22a2 away from the electrode component 3, the first accommodating groove 51 includes a first groove 512 surrounded by the surrounding portion 22a1 and the pole body 21, and recessed in a direction away from the electrode component 3, and the conductive portion 4 is connected to the pole body 21 through the first groove 512. That is, at least part of the avoidance hole 22a2 constitutes the first groove 512, and the outer contour of the orthographic projection of the first groove 512 on the first shell wall 111 (equivalent to the orthographic projection of the first groove 512 onto the projection plane perpendicular to the wall thickness direction of the first shell wall 111) is located within the outer contour range of the orthographic projection of the pole body 21 on the first shell wall 111 (equivalent to the orthographic projection of the pole body 21 onto the projection plane perpendicular to the wall thickness direction of the first shell wall 111).

[0293] The inner end surface 211 of the pole body 21 is arranged further away from the electrode component 3 relative to the surrounding portion 22a1, so that the first receiving groove 51 includes a first groove 512 formed between the pole body 21 and the surrounding portion 22a1 of the first adapter structure 22a. Thus, by providing a step between the pole body 21 and the surrounding portion 22a1, the first groove 512 can be naturally formed by the relative position of the pole body 21 and the first adapter structure 22a, and the first groove 512 can be easily obtained.

[0294] For example, in combination Fig.21 and Fig. 22, when the first adapter structure 22a includes a surrounding portion 22a1 located on the side of the pole body 21 facing the electrode component 3, and the surrounding portion 22a1 and the pole body 21 form a first groove 512 that is recessed in a direction away from the electrode component 3, the first adapter structure 22a may also include a first adapter ring 221 and a second adapter ring 222, the second adapter ring 222 being located on the side of the first adapter ring 221 away from the electrode component 3, the outer ring of the first adapter ring 221 being connected to the first shell wall 111, and the inner ring of the first adapter ring 221 and the inner ring of the second adapter ring 222 respectively clamp the pole body 21 through the first insulating structure 23a. However, in this example, the first adapter ring 221 may include a first step portion 2211 (for example, a first step portion 2211) that surrounds the pole body 21 and protrudes relative to the first shell wall 111 in a direction away from the electrode component 3 Fig. 22 As shown), the second adapter ring 222 is connected to the first step portion 2211; or, the first adapter ring 221 may also be a planar structure (for example Fig.21 ), but does not include a first step portion 2211 that surrounds the pole body 21 and protrudes relative to the first shell wall 111 in a direction away from the electrode component 3.

[0295] Alternatively, illustratively, when the first adapter structure 22a includes a surrounding portion 22a1 located on the side of the pole body 21 facing the electrode component 3, and the surrounding portion 22a1 and the pole body 21 form a first groove 512 that is recessed in a direction away from the electrode component 3, the first adapter structure 22a may also include a third adapter ring 223, and the first extension portion 2231 and the second extension portion 2232 of the third adapter ring 223 respectively clamp the pole body 21 through the first insulating structure 23a. However, in this example, the third adapter ring 223 may include a second step portion 2232 that surrounds the pole body 21 and bulges relative to the first shell wall 111 in a direction away from the electrode component 3, or the third adapter ring 223 may also be a planar structure (for example Fig.21 ), but does not include a second step portion 2232 that surrounds the pole body 21 and bulges relative to the first shell wall 111 in a direction away from the electrode component 3.

[0296] In some embodiments of this application, please refer to Fig. 22 The first adapter structure 22a bulges relative to the first shell wall 111 in a direction away from the electrode component 3 to define a base groove 511 that is recessed relative to the first shell wall 111 in a direction away from the electrode component 3. The base groove 511 is open toward the electrode component 3 and is connected to the side of the first groove 512 that faces the electrode component 3. The conductive portion 4 extends into the first groove 512 through the base groove 511 and is connected to the pole body 21.

[0297] The first adapter structure 22a is constructed to be a shape that is raised relative to the first shell wall 111 in the direction away from the electrode component 3, so that the first adapter structure 22a surrounds a base groove 511 that is recessed in the direction away from the electrode component 3, wherein, since the first adapter structure 22a needs to surround the pole body 21, the first adapter structure 22a has a center ring hole (for example, the above-mentioned avoidance hole 22a2 can be a part of the center ring hole), and the part of the base groove 511 opposite to the center ring hole can be partially occupied by the pole body 21, and can also be not occupied by the pole body 21.

[0298] Therefore, the first receiving groove 51 includes a base groove 511 and a first groove 512, and the conductive part 4 is connected to the pole body 21 through the base groove 511 and the first groove 512, so that the volume of the first receiving groove 51 can be increased, and the space occupied by the conductive part 4 in the receiving cavity 13 can be further reduced.

[0299] Combination Fig.23 and Fig.24 , Fig.23 A partial cross-sectional view of a battery cell provided for some embodiments of the present application; Fig.24 A partial cross-sectional view of a battery cell provided in some embodiments of the present application; in some embodiments of the present application, the pole component 2 includes a pole body 21, the conductive portion 4 is connected to the pole body 21, the pole body 21 includes a first pole piece 21a and a second pole piece 21b, the second pole piece 21b is connected to the first transition structure 22a and the second pole piece 21b defines a matching hole 21b1, the first pole piece 21a is assembled on the second pole piece 21b, and is located on the side of the second pole piece 21b away from the electrode component 3 and is covered with a matching hole 21b1. The first receiving groove 51 includes a second groove 513 surrounded by the first pole piece 21a and the second pole piece 21b. The outer contour of the orthographic projection of the second groove 513 on the first shell wall 111 (equivalent to the orthographic projection of the second groove 513 onto the projection plane perpendicular to the wall thickness direction of the first shell wall 111) is located within the outer contour range of the orthographic projection of the pole body 21 on the first shell wall 111 (equivalent to the orthographic projection of the pole body 21 onto the projection plane perpendicular to the wall thickness direction of the first shell wall 111). Therefore, the pole body 21 is configured to be assembled from two parts to define the second groove 513 by itself, thereby facilitating the acquisition of the second groove 513.

[0300] In addition, in this embodiment, the first adapter structure 22a is not limited in structure, for example, it can be in the form of the fourth adapter ring 227 (for example, refer to Fig.24), the second pole piece 21b is passed through the matching ring portion 2271 of the fourth adapter ring 227 and is clamped on both sides of the inner and outer sides of the matching ring portion 2271 by the first insulating structure 23a (the fourth adapter ring 227 may include a third step portion 2273 surrounding the pole body 21 and protruding relative to the first shell wall 111 in the direction away from the electrode component 3, or it may also be a planar structure); or it may also be a combination of the above-mentioned first adapter ring 221 and the second adapter ring 222 (the first adapter ring 221 may include a first step portion 2211 surrounding the pole body 21 and protruding relative to the first shell wall 111 in the direction away from the electrode component 3, or it may also be a planar structure); or it may also be the above-mentioned third adapter ring 223 form (the third adapter ring 223 may include a second step portion 2232 surrounding the pole body 21 and protruding relative to the first shell wall 111 in the direction away from the electrode component 3, or it may also be a planar structure).

[0301] In some embodiments of this application, please refer to Fig.24 The first adapter structure 22a bulges relative to the first shell wall 111 in a direction away from the electrode component 3 to define a base groove 511 that is recessed relative to the first shell wall 111 in a direction away from the electrode component 3. The base groove 511 is open in the direction of the electrode component 3 and is connected to the side of the second groove 513 facing the electrode component 3. The conductive portion 4 extends into the second groove 513 through the base groove 511 and is connected to the pole body 21.

[0302] The first adapter structure 22a is constructed to be a shape that is raised relative to the first shell wall 111 in the direction away from the electrode component 3, so that the first adapter structure 22a surrounds a base groove 511 that is recessed in the direction away from the electrode component 3, wherein, since the first adapter structure 22a needs to surround the pole body 21, the first adapter structure 22a has a central annular hole, and the portion of the base groove 511 opposite to the central annular hole can be partially occupied by the pole body 21, or can not be occupied by the pole body 21.

[0303] Thus, the first receiving groove 51 includes a base groove 511 and a second groove 513, and the conductive part 4 is connected to the pole body 21 through the base groove 511 and the second groove 513, so that the volume of the first receiving groove 51 can be increased, and the space occupied by the conductive part 4 in the receiving cavity 13 can be further reduced.

[0304] In any of the above embodiments, the first insulating structure 23a may include a sealing structure 231, which is arranged around the circumferential side of the first adapter structure 22a facing the pole body 21, and at least a portion of the sealing structure 231 is clamped between the first adapter structure 22a and the pole body 21 in the inner and outer directions of the first shell wall 111. In this embodiment, the sealing structure 231 is made of a material that has both sealing and insulating properties, such as an elastic rubber member.

[0305] The direction from the inner side of the first shell wall 111 to the outer side of the first shell wall 111, and the direction from the outer side of the first shell wall 111 to the inner side of the first shell wall 111 are collectively referred to as the “inner-outer direction of the first shell wall 111 (e.g. Fig.11 The “inner side of the first shell wall 111” refers to the side of the first shell wall 111 facing the electrode component 3, and the “outer side of the first shell wall 111” refers to the side of the first shell wall 111 facing away from the electrode component 3.

[0306] Thus, by setting at least a portion of the sealing structure 231 in the inner and outer directions of the first shell wall 111 (for example Fig.11 In the fifth direction F5) shown in the figure, it is clamped between the first adapter structure 22a and the pole body 21 to achieve axial sealing between the first adapter structure 22a and the pole body 21. The axial sealing can achieve a more reliable sealing effect and improve the leakage problem at the matching position of the first adapter structure 22a and the pole body 21.

[0307] In addition, if the pole component only includes the pole body, and an axial seal is provided between the pole body and the first shell wall, it is necessary to apply sealing pressure along the axial direction of the mounting hole, which will cause excessive force on the first shell wall. However, the embodiment of the present application can reduce the axial force on the first shell wall 111 by integrating the axial seal (such as the sealing structure 231) into the pole component 2. Moreover, by providing the sealing structure 231 around the inner ring of the first transition structure 22a, the sealing structure 231 can be close to the matching position of the first transition structure 22a and the pole body 21, which is conducive to sealing the matching position of the first transition structure 22a and the pole body 21 in a shorter path, improving the reliability of the seal, and also helping to reduce the size of the sealing structure 231, reduce the sealing area, and easily realize compression sealing thereof, so that the seal is not easy to fail, thereby improving the sealing effect.

[0308] For example, please refer to Figure 6, the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 satisfies 10% to 60%, and this range is applicable to both the positive pole component 2 and the negative pole component 2. Further, the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 can also satisfy 25% to 40%, for example, the width W2 of the pole component 2 is about 21 mm, the length L2 of the pole component 2 is about 63 mm, and the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 is about 33%.

[0309] Therefore, by setting the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 to meet 10% to 60%, the overall area of ​​the pole component 2 can be relatively large, which is beneficial for the electrical connection area between the pole component 2 and the electrode component 3 to meet relatively large requirements. At the same time, the width of the pole component 2 is relatively small relative to the length. In this way, when connecting the pole component 2 and the electrode component 3, the pole component 2 can be placed with one side edge in the width direction facing the active material coating portion 32. Since the width of the pole component 2 is small, it is beneficial to shorten the distance between the pole component 2 and the active material coating portion 32, thereby shortening the length of the conductive portion 4 and reducing the redundancy of the conductive portion 4.

[0310] For example, please refer to Figure 6 , the pole component 2 can be set to: the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is 20% to 90%, and this range is applicable to both the positive pole component 2 and the negative pole component 2. Further, the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is 70% to 80%. For example, the width W2 of the pole component 2 is about 21mm, the width W1 of the first shell wall 111 is about 28m, and the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is about 75%. Thereby, it is beneficial for the pole component 2 to make full use of the space in the width direction of the first shell wall 111. Exemplarily, the width W1 of the first shell wall 111 is consistent with the size of the battery cell 102 in the width direction of the first shell wall 111, for example Figure 3 The width of the first shell wall 111 shown in FIG. 1 is consistent with the size of the battery cell 102 in the second direction F2 .

[0311] For example, please refer to Figure 6When two pole components 2 are arranged on the first shell wall 111 and are spaced apart along the length direction of the first shell wall 111, the ratio of the length L2 of the pole component 2 to the length L1 of the first shell wall 111 is 25%±15% (i.e., 10% to 40%), and this range is applicable to both the positive pole component 2 and the negative pole component 2. Further, the ratio of the length L2 of the pole component 2 to the length L1 of the first shell wall 111 is 15% to 30%. For example, the length L2 of the pole component 2 is about 63 mm, the length L1 of the first shell wall 111 is about 297 mm, and the ratio of the length L2 of the pole component 2 to the length L1 of the first shell wall 111 is about 21%. Thus, it is beneficial for the pole component 2 to make full use of the space in the length direction of the first shell wall 111. Thus, it is beneficial for the pole component 2 to make full use of the space in the length direction of the first shell wall 111. Exemplarily, the length L1 of the first shell wall 111 is consistent with the size of the battery cell 102 in the length direction of the first shell wall 111, for example Figure 3 The length of the first shell wall 111 shown in FIG. 1 is consistent with the dimension of the battery cell 102 in the third direction F3 .

[0312] For example, please refer to Fig.31 , Fig.31 An exploded view of a partial structure of a battery cell provided in some embodiments of the present application, wherein the shape of the mounting hole 112 matches the contour shape of the pole component 2. For example, when the pole component 2 includes a first adapter structure 22a, the contour shape of the first adapter structure 22a (that is, the outer ring shape of the first adapter structure 22a) matches the shape of the mounting hole 112, thereby facilitating the connection between the pole component 2 and the first shell wall 111, and facilitating the pole component 2 to expose more area toward the accommodating cavity 13, thereby facilitating the storage of the conductive part 4 and / or the connection with the conductive part 4.

[0313] Exemplarily, the shape of the mounting hole 112 matches the contour shape of the pole component 2, and is orthographically projected on a projection plane perpendicular to the thickness direction of the first shell wall 111. The orthographic projection of the mounting hole 112 on the projection plane completely falls within the orthographic projection range of the pole component 2 on the projection plane, so that the first shell wall 111 and the pole component 2 have a certain overlapping area, which is conducive to the simple and reliable connection between the two.

[0314] Exemplarily, the mounting hole 112 is an elongated hole (eg, rectangular, elliptical, or racetrack-shaped, etc.), and the pole component 2 is formed into an elongated structure (eg, rectangular, elliptical, or racetrack-shaped, etc.) matching the shape of the mounting hole 112 . When the electrode component 3 is first connected to the pole component 2, and then the pole component 2 is extended from the mounting hole 112 to the outside of the first shell wall 111, and then the pole component 2 is flipped from the outside of the first shell wall 111 to cover the pole component 2 at the mounting hole 112, and then the pole component 2 is connected to the first shell wall 111, if the pole component 2 is set to a long strip structure matching the shape of the mounting hole 112, the pole component 2 can be adjusted to pass through the mounting hole 112 at an angle close to the width direction of the mounting hole 112. After the pole component 2 passes through the mounting hole 112, the thickness direction of the pole component 2 is rotated to be close to the thickness direction of the first shell wall 111. In this way, the space required for the flipping movement of the pole component 2 is small, and the space required for the flipping of the pole component 2 can be reduced, which is conducive to shortening the length of the conductive part 4, saving materials, and reducing costs. It can also reduce the redundancy of the conductive part 4 and reduce the space occupied by the conductive part 4 in the accommodating cavity 13, which is conducive to improving the energy density of the battery cell 102.

[0315] Please refer to Fig.25 , Fig.25 A partial cross-sectional view of a battery cell provided in some embodiments of the present application; in some embodiments of the present application, the pole component 2 is covered on the side of the first shell wall 111 away from the electrode component 3, and the pole component 2 includes a pole body 21, a second adapter structure 22b and a second insulating structure 23b, and the second adapter structure 22b surrounds the pole body 21 and is connected to the first shell wall 111. The second insulating structure 23b is insulated and fitted between the second adapter structure 22b and the pole body 21, and the conductive part 4 is connected to the pole body 21. For example, the outer ring of the second adapter structure 22b and the first shell wall 111 can be welded, riveted, punched, or bonded.

[0316] For example, please refer to Fig.25 The first shell wall 111 has a mounting hole 112, and a sealing ring 14 is arranged around the mounting hole 112. The sealing ring 14 is clamped between the pole component 2 and the first shell wall 111. The pole component 2 and the sealing ring 14 form a second receiving groove 52 that is recessed in a direction away from the electrode component 3. The receiving groove 5 includes the second receiving groove 52. Therefore, the pole component 2 has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall 111, and defines the second receiving groove 52.

[0317] Please refer to Fig.26 , Fig.26A partial cross-sectional view of a battery cell provided for some embodiments of the present application; in some embodiments of the present application, the pole body 21 includes a first pole piece 21a and a second pole piece 21b, the second pole piece 21b is connected to the first shell wall 111, and the second pole piece 21b defines a matching hole 21b1, the first pole piece 21a is assembled on the side of the second pole piece 21b away from the electrode component 3, and the receiving groove 5 includes a third receiving groove 53 surrounded by the first pole piece 21a and the second pole piece 21b. For example, the second pole piece 21b and the first shell wall 111 can be welded, riveted, punched, or bonded. Thus, the pole body 21 is configured to be assembled from two parts to define the third receiving groove 53 by itself, thereby facilitating the acquisition of the third receiving groove 53.

[0318] For example, reference Fig.26 , the second pole piece 21b defines a matching hole 21b1, the first pole piece 21a is assembled on the side of the second pole piece 21b away from the electrode component 3 and covers the matching hole 21b1, the surface of the first pole piece 21a facing the electrode component 3 is a plane, and the space in the matching hole 21b1 on the side of the first pole piece 21a facing the electrode component 3 is the third receiving groove 53. Alternatively, illustratively, the first pole piece 21a itself defines a groove that is recessed in the direction away from the electrode component 3, and the groove and the matching hole 21b1 together constitute the third receiving groove 53.

[0319] For any of the cases where the receiving groove 5 includes at least the first groove 512, or at least the second groove 513, or at least the second receiving groove 52, or at least the third receiving groove 53, in some embodiments, please refer to Fig.21 The inner end surface 211 of the pole body 21 includes a matching area 211a that participates in defining the slot wall of the receiving slot 5, and the conductive portion 4 is connected to the matching area 211a through the receiving slot 5, and combined with Figure 6 The matching area 211 a is formed as a long strip area (eg, rectangular, elliptical, racetrack, etc.) extending along the length direction of the first shell wall 111 .

[0320] In this way, the matching area 211a of the inner end surface 211 of the pole body 21 is relatively large, which is conducive to laying the pole connecting part of the conductive part 4 (such as the retracted part 313 of the pole ear part 33 described in this article, or the second connecting section 412 or the first conductive section 415 of the conductive member 41) on the matching area 211a of the inner end surface 211 of the pole body 21 (for example, the pole connecting part is also in the shape of a long strip), which is conducive to increasing the connection area between the conductive part 4 and the pole body 21, thereby improving the charging performance.

[0321] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described herein (such as an ultrasonic weld), or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0322] For example, in combination Fig.21 When the accommodating groove 5 includes at least the above-mentioned first groove 512, the groove wall on the side of the first groove 512 facing away from the electrode component 3 is the matching area 211a, the first groove 512 can be set as a long strip groove, and the matching area 211a is a long strip area. The pole connecting part (for example, the gathering part 313 of the pole ear part 33 described in this article, or the second connecting section 412 or the first conductive section 415 of the conductive member 41) can be extended into the first groove 512 and laid in the matching area 211a to connect with the matching area 211a.

[0323] For example, in combination Fig.23 When the accommodating groove 5 includes at least the above-mentioned second groove 513, the groove wall on the side of the second groove 513 facing away from the electrode component 3 is the matching area 211a, the second groove 513 can be set as a long strip groove, and the matching area 211a is a long strip area. The pole connecting part can be extended into the second groove 513 and laid in the matching area 211a to connect with the matching area 211a.

[0324] For example, in combination Fig.25 When the accommodating groove 5 includes at least the above-mentioned second accommodating groove 52, the groove wall on the side of the second accommodating groove 52 that is away from the electrode component 3 is the matching area 211a. The second accommodating groove 52 can be set as a long strip groove, and the matching area 211a is a long strip area. The pole connecting part can be extended into the second accommodating groove 52 and laid in the matching area 211a to connect with the matching area 211a.

[0325] For example, in combination Fig.26 When the accommodating groove 5 includes at least the above-mentioned third accommodating groove 53, the groove wall on the side of the third accommodating groove 53 that is away from the electrode component 3 is the matching area 211a. The third accommodating groove 53 can be set as a long strip groove, and the matching area 211a is a long strip area. The pole connecting part can be extended into the third accommodating groove 53 and laid in the matching area 211a to connect with the matching area 211a.

[0326] For any of the cases where the receiving groove 5 includes at least the first groove 512, or at least the second groove 513, or at least the second receiving groove 52, or at least the third receiving groove 53, in some embodiments, please refer to Fig. 22The inner end surface 211 of the pole body 21 includes a matching area 211a that participates in defining the slot wall of the accommodating slot 5. The conductive portion 4 includes a pole ear portion 33 and a conductive member 41 connected to the pole ear portion 33. The conductive member 41 is connected to the matching area 211a through the accommodating slot 5.

[0327] Thus, by providing the adapter 41, the shape and material of the conductive member 41 can be flexibly adjusted to meet the connection requirements of different positions. For example, when the matching area 211a of the inner end surface 211 of the pole body 21 is relatively small (for example, the matching area 211a is only circular), the pole connection part of the adapter 41 can be set relatively small so that the pole connection part can extend into the receiving groove 5 and be laid on the matching area 211a to connect with the matching area 211a.

[0328] Exemplarily, if the portion where the pole ear portion 33 is connected to the adapter 41 (such as the retracted portion 313 described herein) is in the shape of an elongated strip, the pole connection portion of the adapter 41 can be set to a shape that matches the mating area 211a (e.g., a circle) to meet the connection requirements.

[0329] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described herein (such as an ultrasonic weld), or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0330] For example, in combination Fig. 22 When the receiving groove 5 includes at least the first groove 512, the groove wall of the first groove 512 on the side away from the electrode component 3 is the matching area 211a, and the conductive member 41 is connected to the matching area 211a through the first groove 512. For example, when the first groove 512 is a circular groove, the matching area 211a is a circular area, and the pole connection part of the adapter 41 can be set relatively small, so that the pole connection part can extend into the first groove 512 and be laid on the matching area 211a to connect with the matching area 211a.

[0331] For example, in combination Fig.24 When the receiving groove 5 at least includes the second groove 513, the groove wall of the second groove 513 on the side away from the electrode component 3 is the matching area 211a, and the conductive member 41 is connected to the matching area 211a through the second groove 513. For example, when the second groove 513 is a circular groove, the matching area 211a is a circular area, and the pole connection part of the adapter 41 can be set relatively small, so that the pole connection part can extend into the second groove 513 and be laid on the matching area 211a to connect with the matching area 211a.

[0332] Exemplarily, when the receiving groove 5 includes at least the second receiving groove 52, the groove wall of the second receiving groove 52 on the side away from the electrode component 3 is the matching area 211a, and the conductive member 41 is connected to the matching area 211a through the second receiving groove 52. For example, when the second receiving groove 52 is a circular groove, the matching area 211a is a circular area, and the pole connection part of the adapter 41 can be set relatively small, so that the pole connection part can extend into the second receiving groove 52 and be laid on the matching area 211a to connect with the matching area 211a.

[0333] Exemplarily, when the receiving groove 5 includes at least the third receiving groove 53, the groove wall of the third receiving groove 53 on one side away from the electrode component 3 is the matching area 211a, and the conductive member 41 is connected to the matching area 211a through the third receiving groove 53. For example, when the third receiving groove 53 is a circular groove, the matching area 211a is a circular area, and the pole connection part of the adapter 41 can be set relatively small, so that the pole connection part can extend into the third receiving groove 53 and be laid on the matching area 211a to connect with the matching area 211a.

[0334] In addition, when the adapter 41 is used, the matching area 211a can also be set to a relatively large area, for example, a relatively large area shape such as a long strip area extending along the length direction of the first shell wall 111.

[0335] For any of the cases where the receiving groove 5 includes at least the first groove 512, or at least the second groove 513, or at least the second receiving groove 52, or at least the third receiving groove 53, in some embodiments, please refer to Fig. 22 The conductive member 41 may include a first conductive segment 415 laid on the matching area 211a, and the conductive member 41 includes a third conductive segment 417 staggered from the matching area 211a. The third conductive segment 417 protrudes toward the electrode component 3 relative to the first conductive segment 415, and the pole ear portion 33 is connected to the third conductive segment 417.

[0336] Thus, the adapter 41 can not only meet the connection requirements with the matching area 211a, but also easily meet the connection requirements with the pole ear portion 33. In addition, when the conductive member 41 includes the first conductive segment 415 and the third conductive segment 417, in order to ensure that the third conductive segment 417 protrudes relative to the first conductive segment 415 toward the electrode component 3, the conductive member 41 can be processed with a material having a certain hardness and thickness, for example, the conductive member 41 can be a metal sheet.

[0337] Exemplarily, if the portion where the pole ear portion 33 is connected to the third conductive segment 417 (such as the gathered portion 313 described in this article) is in the shape of an elongated strip, the third conductive segment 417 can also be set to be in the shape of an elongated strip, and at the same time, the first conductive segment 415 can be set to a shape that matches the matching area 211a (for example, a circle), which can meet the connection requirements.

[0338] In addition, according to the different shapes of the receiving groove 5 , the third conductive segment 417 can be accommodated in the receiving groove 5 , or the third conductive segment 417 can be arranged outside the receiving groove 5 .

[0339] Please refer to Fig. 27 , Fig. 27 A partial cross-sectional view of a battery cell provided for some embodiments of the present application; in some embodiments of the present application, the first shell wall 111 includes a raised structure 1114 raised in a direction away from the electrode component 3 (i.e., away from the active material coating portion 32), and a mounting hole 112 is passed through the raised structure 1114. The pole component 2 is provided at the mounting hole 112 and forms a fourth receiving groove 54 with the raised structure 1114, which is recessed in a direction away from the electrode component 3 (i.e., away from the active material coating portion 32), and the receiving groove 5 includes a fourth receiving groove 54. Thus, by designing the step-shaped structure of the first shell wall 111 to construct the fourth receiving groove 54, the design of the pole component 2 can be more diverse. In addition, in the present embodiment, the type of the pole component 2 is not limited, and it can be the pole component in any of the above embodiments. Based on the different types of the pole component 2, different connection methods can be selected with the raised structure 1114, such as welding, riveting, etc., which will not be described in detail here. For example, refer to Fig. 27 The pole component 2 may include a pole body 21 and a third insulating structure 23 c , and the third insulating structure 23 c is insulated and fitted between the pole body 21 and the protruding structure 1114 .

[0340] In an embodiment of the present application, the receiving groove 5 can also be a combination of any one of the first receiving groove 51, the second receiving groove 52, the third receiving groove 53 and the fourth receiving groove 54, which is beneficial to increase the volume of the receiving groove 5 and realize the diversity of the receiving groove 5.

[0341] In addition, illustratively, the first adapter structure 22a (eg, the first adapter ring 221 , the third adapter ring 223 or the fourth adapter ring 227 ) or the first shell wall 111 may be constructed into a shape that bulges relative to the first shell wall 111 in a direction away from the electrode component 3 by a stamping process.

[0342] Please refer again Figure 7In some embodiments of the present application, at least part of the pole ear portion 33 is accommodated in the accommodation groove 5 and extends to the pole part 2 and is connected to the pole part 2, for example, by welding, bonding by conductive adhesive, or connecting by punching, etc. In this case, the conductive portion 4 may only include the pole ear portion 33, and the conductive member 41 extending from the pole ear portion 33 to the pole body 21 may be omitted, thereby eliminating the material cost of the conductive member 41 and eliminating the step of connecting the conductive member 41 with the pole ear portion 33.

[0343] In some embodiments of the present application, reference Figure 7 The pole ear portion 33 includes a gathered portion 313 formed by stacking and connecting a plurality of pole ear sheets 311 .

[0344] Exemplarily, the pole ear portion 33 of the electrode component 3 includes a stacked portion 312 formed by stacking and gathering multiple pole ear sheets 311, and the multiple pole ear sheets 311 in the stacked portion 312 are connected to form a gathered portion 313. The electrode component 3 includes one or more electrode assemblies 31, and the electrode assembly 31 has a positive pole ear sheet 311 and a negative pole ear sheet 311. Multiple pole ear sheets 311 of the same polarity are stacked and gathered to form the stacked portion 312, so as to facilitate the pretreatment of the pole ear portion 33 or the connection operation with other components.

[0345] Exemplarily, the multiple layers of tab sheets 311 in the stacking section 312 may belong to the same electrode assembly 31, or may respectively belong to different electrode assemblies 31, that is, several layers of tab sheets 311 of the same polarity in the same electrode assembly 31 may be gathered together to form the stacking section 312, or several layers of tab sheets 311 of the same polarity in different electrode assemblies 31 may be gathered together to form the stacking section 312. Exemplarily, all the tab sheets 311 of the same polarity in the electrode component 3 may be gathered together to form the stacking section 312, so that the number of stacking sections 312 can be reduced.

[0346] In the above technical solution, the multi-layered pole tabs 311 in the stacked portion 312 are connected to form the gathered portion 313, so that the multi-layered pole tabs 311 in the gathered portion 313 are electrically conductive, that is, the multi-layered pole tabs 311 in the gathered portion 313 not only present a stacked arrangement relationship, but also have a connected and conductive relationship. Among them, the connection method of the multi-layered pole tabs 311 in the gathered portion 313 is not limited, for example, it can be welding (such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure melting welding, or brazing, etc.), or perforation connection, or bonding by conductive adhesive, etc. Exemplarily, the multi-layered pole tabs 311 of the same polarity can be ultrasonically welded, and the ultrasonic weld mark formed is the gathered portion 313.

[0347] Exemplarily, the multiple layers of tab sheets 311 in the gathered portion 313 may belong to the same electrode assembly 31, or may respectively belong to different electrode assemblies 31, that is, several layers of tab sheets 311 of the same polarity in the same electrode assembly 31 may be connected to form the gathered portion 313, or several layers of tab sheets 311 of the same polarity in different electrode assemblies 31 may be connected to form the gathered portion 313. Exemplarily, all tab sheets 311 of the same polarity in the electrode component 3 may be connected to form the gathered portion 313, so that the number of the gathered portions 313 may be reduced.

[0348] In the above technical solution, the multi-layer pole ear sheets 311 in the pole ear portion 33 are pre-connected to form a gathered portion 313. The gathered portion 313 can present the form of a plate in which the multi-layer pole ear sheets 311 are connected together and have a certain rigidity, rather than a fluffy multi-layer foil form, thereby facilitating the assembly and connection operations between the pole ear portion 33 and other components, such as punching operations and welding operations, etc., so that pores are not easily formed in the weld formed by the pole ear portion 33 and other components, which can improve the connection reliability and conductivity of the welding point, and make the conductivity of the electrode component 3 and the pole column component 2 more stable and reliable.

[0349] Exemplarily, during processing, multiple electrode assemblies 31 may be stacked first, and the multi-layered pole tabs 311 of the same polarity of the multiple electrode assemblies 31 may be ultrasonically welded to form a gathered portion 313, thereby improving the problem of tensile stress between the pole tabs 311 caused by the asynchrony of the electrode assemblies 31, which may cause cracking of the gathered portion 313 in the form of ultrasonic weld marks.

[0350] In some embodiments of this application, please refer to Figure 5 The electrode component 3 includes a plurality of electrode assemblies 31 stacked and arranged, and the pole tabs 311 of the plurality of electrode assemblies 31 gather toward the direction of the receiving groove 5. For example, when processing the battery cell 102, the plurality of electrode assemblies 31 can be stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the stacked plurality of electrode assemblies 31 can be bound by a binding member (such as blue glue). For example, a lamination portion 312 can be formed at the gathering place. Among them, since a clearance space is formed on one side of the receiving groove 5 facing the electrode component 31, the pole tabs 311 are gathered into the space, which is conducive to making full use of the space, so that the receiving groove 5 can accommodate the conductive part 4 to a greater extent, which is conducive to further reducing the space occupied by the conductive part 4 in the receiving cavity 13, and is conducive to improving the energy density of the battery cell 102.

[0351] However, the present application is not limited thereto. For example, when the pole ear portion 33 is connected to the second conductive segment 416 of the conductive member 41, the pole ear pieces 311 of the plurality of electrode assemblies 31 may be gathered toward the direction of the second conductive segment 416. At this time, the second conductive segment 416 may be located in the receiving slot 5 or outside the receiving slot 5. When the second conductive segment 416 is located in the conductive slot 5, the pole ear pieces 311 of the plurality of electrode assemblies 31 are equivalent to being gathered toward the direction of the receiving slot 5. However, when the second conductive segment 416 is located outside the conductive slot 5, the pole ear pieces 311 of the plurality of electrode assemblies 31 are gathered toward the direction outside the receiving slot 5.

[0352] For example, when the pole ear portion 33 is connected to the third conductive segment 417 of the conductive member 41, the pole ear pieces 311 of the plurality of electrode assemblies 31 may be gathered toward the direction of the third conductive segment 417, and at this time, the third conductive segment 417 may be located in the receiving slot 5 or outside the receiving slot 5. When the third conductive segment 417 is located in the conductive slot 5, the pole ear pieces 311 of the plurality of electrode assemblies 31 are equivalent to being gathered toward the direction of the receiving slot 5, but when the third conductive segment 417 is located outside the conductive slot 5, the pole ear pieces 311 of the plurality of electrode assemblies 31 are gathered toward the direction outside the receiving slot 5.

[0353] Please refer again Figure 7 In some embodiments of the present application, the surface of one side of the pole body 21 facing the electrode component 3 is the inner end surface 211 of the pole body 21, and the inner end surface 211 of the pole body 21 participates in forming the accommodating groove 5, and at least part of the gathered portion 313 is laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21 (for example, welding, bonding, punching connection, etc.). Among them, "laid" means that at least part of the surface of one side of the gathered portion 313 in the thickness direction is face-to-face with the inner end surface 211 of the pole body 21.

[0354] Thus, by pre-connecting (e.g., ultrasonic welding) the multiple layers of the pole tab sheets 311 in the pole tab portion 33 to form the gathered portion 313, the gathered portion 313 can present a plate form in which the multiple layers of the pole tab sheets 311 are connected together and have a certain rigidity, rather than a fluffy and scattered multiple layers of foil, so as to facilitate the matching connection between the pole tab portion 33 and the pole body 21, making the welding of the pole tab portion 33 and the pole body 21 more reliable, and it is not easy to form pores in the weld, which can improve the connection reliability and conductivity of the welding point, and make the conduction of the electrode component 3 and the pole component 2 more stable and reliable. Moreover, by laying at least part of the gathered portion 313 on the inner end surface 211 of the pole body 21, the connection area between the pole tab portion 33 and the pole body 21 can be increased, and the connection reliability and current carrying capacity can be improved.

[0355] Please refer again Figure 7In some embodiments of the present application, the gathering portion 313 is completely laid on the inner end surface 211 of the pole body 21. That is, the inner end surface 211 of the pole body 21 is greater than or equal to the area of ​​the gathering portion 313, so that the gathering portion 313 can completely fall on the inner end surface 211 of the pole body 21, so that the gathering portion 313 can be completely flattened, and the projection of the gathering portion 313 completely falls on the inner end surface 211 of the pole body 21, so that the pole ear portion 33 will not be damaged due to the bending of the gathering portion 313, and the charging performance of the pole ear portion 33 is improved, and it is beneficial to increase the connection area between the inner end surface 211 of the pole body 21 and the gathering portion 313, improve the current passing efficiency, and facilitate the welding pressure nozzle to press the gathering portion 313, and improve the connection reliability between the gathering portion 313 and the pole body 21.

[0356] For example, refer to Fig.28 , Fig.28 A partial cross-sectional view of a battery cell provided for some embodiments of the present application; when the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, and the inner end surface 211 of the pole body 21 is smaller than the area of ​​the gathered portion 313, a portion of the gathered portion 313 can be laid on the inner end surface 211 of the pole body 21, and the remaining portion can be laid on the surrounding area 2201. At this time, the gathered portion 313 can also be in a completely flat and expanded state.

[0357] In some embodiments of this application, please refer to Figure 5 , the pole ear portion 33 is connected to the pole body 21 through the conductive member 41, and at least part of the conductive member 41 is accommodated in the accommodation groove 5. Therefore, by indirectly connecting the pole ear portion 33 and the pole body 21 through the conductive member 41, the length of the pole ear portion 33 can be shortened, and the problems of wrinkling, bending and breaking of the pole ear piece 311 can be improved. Moreover, by flexibly designing the shape and material of the conductive member 41, the difficulty of connecting with the pole body 21 can be reduced, and the convenience of connecting the conductive member 41 and the pole body 21 can be improved.

[0358] By way of example, the laminated part 312 may be connected to the conductive member 41, thereby eliminating the step of connecting the laminated part 312 to form the gathered part 313. Alternatively, by way of example, the gathered part 313 may be connected to the conductive member 41 after the multilayered tabs 311 in the laminated part 312 are connected to form the gathered part 313, thereby flexibly and diversely designing the structural form of the conductive member 41.

[0359] For example, please refer again to Figure 5, the conductive member 41 can be connected to the inner end face 211 of the pole body 21, so that the length of the conductive member 41 can be shortened. For example, the conductive member 41 can include a second connecting section 412, and the second connecting section 412 can be laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21, so as to improve the connection reliability and charging performance of the conductive member 41 and the pole body 21. Alternatively, illustratively, the conductive member 41 can also be connected to other positions of the pole body 21, for example, the conductive member 41 is pre-buried in the pole body 21, or is penetrated in the pole body 21 to be connected to the pole body 21, etc.

[0360] In some embodiments of this application, please refer to Figure 29A-Figure 29D , Figure 29A-Figure 29D The processing diagram of the battery cell provided for one embodiment of the present application is as follows: The conductive member 41 includes a first connecting section 411, and the first connecting section 411 includes two clamping parts 4110. The pole ear portion 33 includes a pole ear end 331, and the pole ear end 331 is clamped between the two clamping parts 4110 and connected to the clamping part 4110 (for example, welding, punching connection, bonding by conductive adhesive, etc.). Among them, the pole ear end 331 can be a laminated part 312 or a folded part 313. Therefore, the two clamping parts 4110 can be used to limit the pole ear end 331, thereby improving the connection reliability of the multi-layer pole ear sheets 311 in the pole ear end 331. In addition, in some examples, by providing two clamping portions 4110, the pole ear end portion 331 clamped between the two clamping portions 4110 can be in the state of the stacking portion 312, and the step of connecting the multiple layers of pole ear sheets 311 in the stacking portion 312 to form the gathered portion 313 can be omitted, thereby simplifying the processing steps and improving the processing efficiency.

[0361] Please refer again Figure 29A-Figure 29D , exemplarily, the conductive member 41 includes a second connecting section 412, the second connecting section 412 is laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21, and the conductive member 41 is bent at the connection position between the first connecting section 411 and the second connecting section 412, so that the first connecting section 411 is located on the side of the second connecting section 412 away from the pole body 21 (or the side facing the active material coating portion 32), and one of the clamping portions 4110 is supported on the side of the pole ear end 331 away from the pole body 21 (or the side facing the active material coating portion 32). Therefore, the support of the pole ear portion 33 by the clamping portion 4110 can improve the redundancy of the pole ear portion 33 and reduce the risk of short circuit caused by the pole ear portion 33 being inserted into the active material coating portion 32. Moreover, the bent conductive member 41 can play the role of buffer support, reduce the risk of the electrode component 3 hitting the first shell wall 111, and improve the reliability of the battery cell 102.

[0362] In addition, in order to facilitate bending, the conductive member 41 can be set to be in the form of reduced material at the connection position between the first connecting segment 411 and the second connecting segment 412, for example, the width can be shortened, or the thickness can be thinned, etc. In this way, the first connecting segment 411 and the second connecting segment 412 can respectively have a certain rigidity, which is convenient for the first connecting segment 411 to be connected to the pole ear portion 33, and to facilitate the connection between the second connecting segment 412 and the pole body 21, and at the same time, it is also convenient for the conductive member 41 to be bent at the connection position between the first connecting segment 411 and the second connecting segment 412.

[0363] In some embodiments of this application, please refer to Figure 30A-Figure 30C , Figure 30A-Figure 30C The processing process of the battery cell provided in an embodiment of the present application is decomposed, the pole ear portion 33 includes a gathered portion 313 formed by stacking and connecting multiple pole ear sheets 311, the conductive member 41 includes a first connecting section 411, and the gathered portion 313 is stacked on one side of the first connecting section 411 in the thickness direction and connected to the first connecting section 411. Among them, the first connecting section 411 is in the form of a plate, and the first connecting section 411 and the gathered portion 313 are in the same thickness direction, and the two are stacked along the thickness direction of the first connecting section 411, so that the matching mode of the gathered portion 313 and the conductive member 41 is simple, which is conducive to improving production efficiency.

[0364] Please refer again Figure 30A-Figure 30C For example, the first connecting section 411 is supported on the side of the gathering portion 313 away from the pole body 21, so that the gathering portion 313 is clamped between the inner end surface 211 of the pole body 21 and the first connecting section 411. Thus, the redundancy of the pole ear portion 33 can be improved by supporting the gathering portion 313 by the first connecting section 411, and the risk of short circuit caused by the pole ear portion 33 being inserted into the active material coating portion 32 can be reduced.

[0365] In some embodiments of this application, please refer to Figure 5 The conductive portion 4 is bent to form at least two opening slots 42, wherein the openings of the two opening slots 42 are oriented in different directions and are adjacent in the direction from the pole body 21 to the active material coating portion 32 (eg Figure 5 As shown, one of the two upper and lower adjacent open slots 42 has an opening facing left, and the other opening facing right). As a result, the conductive portion 4 can present a reciprocating serpentine shape, and the conductive portion 4 can play a buffering role. When the battery cell 102 is used in a vibration environment, the impact of the active material coating portion 32 toward the first shell wall 111 can be reduced, which plays a role in protecting the electrode component 3 and improving the reliability of the battery cell 102. Moreover, since the conductive portion 4 does not extend irregularly, the mutual interference and scratching between the pole tabs 311 and the pole tabs 311 in the conductive portion 4, as well as the risk of the pole tabs 311 being inserted upside down into the active material coating portion 32 can be improved, thereby further improving the reliability of the battery cell 102.

[0366] For example, please refer again to Figure 5 When the conductive portion 4 includes the pole ear portion 33 and the conductive member 41 connected to the pole ear portion 33, and the pole ear portion 33 is connected to the pole body 21 through the conductive member 41, the conductive member 41 and the pole ear portion 33 are bent together to form two opening grooves 42 with opposite opening directions and adjacent to each other. For example, an opening groove 42 is defined between the first connecting section 411 and the second connecting section 412, and another opening groove 42 is defined between the first connecting section 411 and the pole ear portion 33. Thus, the conductive portion 4 can present a reciprocatingly bent S shape, thereby shortening the length of the conductive portion 4, simplifying the structure of the conductive portion 4, and facilitating the processing of the conductive portion 4. Alternatively, for example, please refer to Fig.23 When the conductive portion 4 is connected to the pole body 21 through the pole ear portion 33 , the pole ear portion 33 is bent alone to form two adjacent opening slots 42 with openings facing opposite directions.

[0367] In some embodiments of this application, please refer to Figure 3 The battery cell 102 further includes a pressure relief device 6, which is provided on the housing component 1. Exemplarily, the pressure relief device 6 may be an explosion-proof valve installed on the housing component 1, or may be integrally formed in a thinned area of ​​the housing component 1. Thus, by providing the pressure relief device 6, when the pressure in the housing component 1 exceeds a preset value, the pressure may be released in a directional manner through the pressure relief device 6, thereby improving the safety and reliability of the battery cell 102.

[0368] For example, in combination Figure 3 , the pressure relief device 6 and the pole component 2 are located on the same side. Since the pole component 2 is arranged on the first shell wall 111, when the pressure relief device 6 is also arranged on the first shell wall 111, the pressure relief device 6 and the pole component 2 are located on the same side, for example, both are arranged on the top of the battery cell 102, or both are arranged on the bottom of the battery cell 102, or both are arranged on the same side of the battery cell 102, etc. In this way, the design of other shell walls other than the first shell wall 111 can be simplified, and the structure and processing of the battery cell 102 can be simplified. Among them, the shell component 1 can be surrounded by multiple non-coplanar walls. For example, the rectangular shell component 1 is surrounded by six walls, one of which is the first shell wall 111. The pressure relief device 6 and the pole component 2 are arranged on the same wall, and the two are located on the same side.

[0369] For example, in combination Figure 6, the pressure relief device 6 and the pole component 2 are located on different sides. Since the pole component 2 is arranged on the first shell wall 111, when the pressure relief device 6 is arranged on other walls of the shell component 1 except the first shell wall 111, for example, the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, the pressure relief device 6 is arranged on the second shell wall 114, or the pressure relief device 6 is arranged on the shell cover 12, then the pressure relief device 6 and the pole component 2 are located on different sides. Therefore, there is no need to consider that the pressure relief device 6 occupies the space of the first shell wall 111 and reduces the volume of the pole component 2, so that the shape and area of ​​the pole component 2 can be flexibly designed as needed. Among them, the shell component 1 can be surrounded by a plurality of non-coplanar wall surfaces, for example, a rectangular shell component 1 is surrounded by six wall surfaces, one of which is the first shell wall 111, the pressure relief device 6 is arranged on any other wall surface except the first shell wall 111, and the pole component 2 is arranged on the first shell wall 111, then the two are located on different sides.

[0370] According to the second aspect of the present application, the present application also provides a battery 100, including a battery cell 102 of any of the above solutions. It is worth noting that the battery 100 according to the embodiment of the present application may include a box body 101, or may not include a box body 101. Therefore, since the reliability of the battery cell 102 according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery 100.

[0371] Exemplarily, the battery 100 may further include a busbar component, and the battery cells 102 are multiple and at least two are electrically connected through the busbar component. Thus, the series connection and / or parallel connection of multiple battery cells 102 can be achieved. For example, when multiple battery cells 102 are connected in series, the pole component 2 of the negative electrode of one battery cell 102 is connected to the pole component 2 of the positive electrode of the next battery cell 102 through a busbar component, and at the same time, the pole component 2 of the positive electrode of the battery cell 102 is connected to the pole component 2 of the negative electrode of the previous battery cell 102 through another busbar component.

[0372] For example, in combination Figure 2 The battery 100 includes a box body 101, a plurality of battery cells 102 are contained in the box body 101, and the bottom of the box body 101 is a box body bottom plate 1013. The pole component 2 is arranged on the side of the shell component 1 facing the box body bottom plate 1013, or on the side of the shell component 1 away from the box body bottom plate 1013.

[0373] When the battery 100 is in use, for example, when it is used in a vehicle, the box bottom plate 1013 is located at the bottom of the box 101 in the direction of gravity. Thus, when the pole component 2 is arranged on the side of the shell component 1 facing the box bottom plate 1013, it means that the pole component 2 is located at the bottom of the shell component 1 in the direction of gravity; and when the pole component 2 is arranged on the side of the shell component 1 away from the box bottom plate 1013, it means that the pole component 2 is located at the top of the shell component 1 in the direction of gravity. Therefore, the relative position of the pole component 2 and the box bottom plate 1013 is not limited, and the orientation of the battery cell 102 and the box 101 can be flexibly set.

[0374] Among them, when the pole component 2 of the battery cell 102 is arranged on the side of the shell component 1 facing the box bottom plate 1013, the battery cell 102 is in an inverted state, and the decompression product is sprayed in the direction away from the passenger compartment, which is safer; when the pole component 2 of the battery cell 102 is arranged on the side of the shell component 1 close to the box bottom plate 1013, the battery cell 102 is in an upright state, and the electrolyte is not easy to leak.

[0375] According to the third aspect of the present application, the present application also provides an electric device, including the battery 100 of any of the above solutions, and the battery 100 is used to provide power to the electric device. The electric device can be any of the above-mentioned devices or systems using the battery 100. Since the performance of the battery 100 is improved, it is beneficial to improve the working power performance of the electric device.

[0376] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0377] Combination Figure 5 The shell component 1 has a receiving cavity 13, and the shell component 1 includes a shell body 11 and a shell cover 12. One end of the shell body 11 has an opening 113. The shell cover 12 is covered on the opening 113 of the shell body 11 to form the receiving cavity 13 together with the shell body 11. The first shell wall 111 has a mounting hole 112. The pole component 2 is mounted on the first shell wall 111 and is disposed at the mounting hole 112. The end of the shell body 11 opposite to the opening 113 serves as the first shell wall 111. Alternatively, the shell cover 12 can also serve as the first shell wall 111.

[0378] The pole component 2 is of a minimalist self-sealing form. The pole component 2 includes a pole body 21, a first adapter structure 22a and a first insulating structure 23a. The outer ring of the adapter structure 22 is welded to the first shell wall 111. The first adapter structure 22a surrounds the pole body 21 and is connected to the first shell wall 111. The first insulating structure 23a is insulated and sealed between the first adapter structure 22a and the pole body 21.

[0379] The first adapter structure 22a bulges relative to the first shell wall 111 in a direction away from the electrode component 3, so that the pole component 2 forms a first receiving groove 51 that is recessed in a direction away from the active material coating portion 32 and open in a direction toward the active material coating portion 32. The surface of the pole body 21 facing the active material coating portion 32 is the inner end surface 211 of the pole body 21, and the inner end surface 211 of the pole body 21 constitutes a partial groove wall of the first receiving groove 51.

[0380] The electrode component 3 includes a plurality of stacked electrode assemblies 31, having an active material coating portion 32 accommodated in the accommodating cavity 13, and a pole ear portion 33 connected to the active material coating portion 32, the pole ear portion 33 is connected to the pole body 21 through a conductive member 41, and at least a portion of the conductive member 41 is located in the first accommodating groove 51 and connected to the inner end surface 211 of the pole body 21.

[0381] The conductive member 41 includes a first connecting section 411 and a second connecting section 412, the first connecting section 411 includes two clamping portions 4110, the pole ear end portion 331 of the pole ear portion 33 is clamped between the two clamping portions 4110 and is welded to the clamping portions 4110, the second connecting section 412 is laid on the inner end surface 211 of the pole body 21 and is welded to the inner end surface 211 of the pole body 21, the conductive member 41 is bent at the connecting position between the first connecting section 411 and the second connecting section 412, so that the first connecting section 411 is located on the side of the second connecting section 412 away from the pole body 21, and one of the clamping portions 4110 is supported on the side of the pole ear end portion 331 away from the pole body 21.

[0382] During processing, multiple electrode assemblies 31 can be stacked first, and the pole tabs 311 of the same polarity of the multiple electrode assemblies 31 are gathered together and welded to the first connecting section 411 of the conductive member 41 at the same time, so as to improve the problem that the tensile stress between the pole tabs 311 is formed due to the asynchrony of the electrode assemblies 31, which causes the cracking of the welding position between the pole tab 33 and the first connecting section 411. Then, the electrode component 3 is installed into the shell body 11, and the second connecting section 412 of the pole body 21 is extended from the mounting hole 112 on the shell body 11, and then the second connecting section 412 is installed into the first receiving groove 51 outside the shell body 11, and welded to the inner end face 211 of the pole body 21, and then the pole component 2 is covered on the mounting hole 112 from the outer side of the shell body 11, and the pole component 2 and the first shell wall 111 are welded, and the mounting hole 112 is sealed after the welding is completed.

[0383] Thus, by providing the receiving groove 5 to receive the conductive part 4, the space occupied by the conductive part 4 in the receiving chamber 13 can be reduced, so that the receiving chamber 13 has a larger space to receive the active material coating part 32, which is beneficial to increase the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open toward the direction of the electrode component 3, the conductive part 4 can be easily extended into the receiving groove 5, reducing the difficulty of operation.

[0384] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0385] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: The shell component has a receiving cavity and includes a first shell wall participating in forming the receiving cavity; An electrode component, housed in the housing cavity; A pole component is located on the same side of the electrode component as the first shell wall and is installed on the first shell wall, and the electrode component is connected to the pole component through a conductive part. The pole component is formed with a receiving groove connected with the receiving cavity, the receiving groove is open toward the electrode component and is at least partially surrounded by the pole component, and at least a part of the conductive part is received in the receiving groove.

2. The battery cell according to claim 1, characterized in that: The receiving groove is recessed relative to the first shell wall in a direction away from the electrode component.

3. The battery cell according to claim 1 or 2, characterized in that: The pole component comprises a pole body connected to the conductive part, a surface of the pole body facing the electrode component is an inner end surface of the pole body, and the inner end surface of the pole body participates in forming the accommodating groove.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The pole component includes a pole body, a first transition structure and a first insulating structure, the first transition structure surrounds the pole body and is connected to the first shell wall, the first insulating structure is insulated and sealed between the first transition structure and the pole body, the conductive portion is connected to the pole body, and the accommodating groove includes a first accommodating groove surrounded by the pole component.

5. The battery cell according to claim 4, characterized in that: The outer contour of the orthographic projection of the first accommodating groove on the first shell wall is located at the periphery of the outer contour of the orthographic projection of the pole body on the first shell wall.

6. The battery cell according to claim 5, characterized in that: The first accommodating groove is formed on a side of the pole body and the first transition structure facing the electrode component.

7. The battery cell according to claim 6, characterized in that: The first transition structure bulges relative to the first shell wall in a direction away from the electrode component, so that the first accommodating groove is recessed relative to the first shell wall in a direction away from the electrode component.

8. The battery cell according to claim 7, characterized in that: The inner end surface of the pole body and the inner end surface of the first adapter structure together form the first accommodating groove.

9. The battery cell according to claim 7 or 8, characterized in that: The first adapter structure comprises a first adapter ring and a second adapter ring, the second adapter ring is arranged on a side of the first adapter ring away from the electrode component, the outer ring of the first adapter ring is connected to the first shell wall, and the inner ring of the first adapter ring and the inner ring of the second adapter ring jointly clamp the pole body through the first insulating structure; The first receiving groove is formed on the first adapter ring and the side of the pole body facing the electrode component. The first adapter ring is raised relative to the first shell wall in a direction away from the electrode component, so that the first receiving groove is recessed relative to the first shell wall in a direction away from the electrode component. The second adapter ring is connected to the raised part of the first adapter ring.

10. The battery cell according to claim 9, characterized in that: The pole body includes a peripheral portion, and the first insulating structure includes a sealing structure; The sealing structure is an integrally formed part, and is clamped between the first adapter ring and the peripheral portion, and between the second adapter ring and the peripheral portion; or The first insulating structure further includes a first insulating member. The sealing structure is clamped between the first adapter ring and the peripheral portion. The second adapter ring is insulated and fixedly matched with the pole body through the first insulating member.

11. The battery cell according to claim 7 or 8, characterized in that: The first adapter structure includes a third adapter ring, the outer ring of the third adapter ring is connected to the first shell wall, the third adapter ring includes a first extension portion and a second extension portion which are integrally arranged, the second extension portion is connected to a side of the first extension portion which is away from the electrode component, and the first extension portion and the second extension portion jointly clamp the pole body through the first insulating structure; The first receiving groove is formed on the side of the third adapter ring and the pole body facing the electrode component, and the third adapter ring is raised relative to the first shell wall in a direction away from the electrode component, so that the first receiving groove is recessed relative to the first shell wall in a direction away from the electrode component.

12. The battery cell according to claim 11, characterized in that: The pole body includes a peripheral portion, and the first insulating structure includes a sealing structure; The sealing structure is an integrally formed part, and is clamped between the first extension portion and the peripheral portion, and between the second extension portion and the peripheral portion; or The first insulating structure further includes a first insulating member, the sealing structure member is clamped between the first extension portion and the peripheral portion, and the first insulating member is clamped between the second extension portion and the peripheral portion.

13. The battery cell according to claim 7 or 8, characterized in that: The first adapter structure includes a fourth adapter ring, the fourth adapter ring includes a matching ring portion, the pole body is passed through the matching ring portion and is clamped on both inner and outer sides of the matching ring portion by the first insulating structure; The first receiving groove is formed on the side of the fourth adapter ring and the pole body facing the electrode component, and the fourth adapter ring is raised relative to the first shell wall in a direction away from the electrode component, so that the first receiving groove is recessed relative to the first shell wall in a direction away from the electrode component.

14. The battery cell according to claim 13, characterized in that: The pole body comprises a penetration portion penetrated through the matching ring portion, and an inner limiting portion and an outer limiting portion connected to the penetration portion and clamped on both inner and outer sides of the matching ring portion; the first insulating structure comprises a sealing structure; The sealing structure is an integrally formed part, and is clamped between the inner limiting portion and the matching ring portion, and between the outer limiting portion and the matching ring portion; or The first insulating structure further includes a second insulating member, the sealing structure member is clamped between the matching ring portion and the inner limiting portion, and the second insulating member is clamped between the outer limiting portion and the matching ring portion.

15. The battery cell according to any one of claims 4 to 14, characterized in that: The inner end surface of the pole body and the inner end surface of the first adapter structure both participate in forming the first accommodating groove, and the position of the inner end surface of the first adapter structure adjacent to the pole body is a surrounding area surrounding the pole body, and the surrounding area is flush with the inner end surface of the pole body.

16. The battery cell according to any one of claims 4 to 14, characterized in that: The inner end surface of the pole body and the inner end surface of the first adapter structure both participate in forming the first accommodating groove, the position of the inner end surface of the first adapter structure adjacent to the pole body is a surrounding area surrounding the pole body, and the inner end surface of the pole body protrudes from the surrounding area toward the direction of the electrode component.

17. The battery cell according to any one of claims 4 to 16, characterized in that: The first adapter structure is formed into a long strip extending along the length direction of the first shell wall, and the contour shape of the pole body matches the contour shape of the first adapter structure.

18. The battery cell according to claim 15, characterized in that: The first adapter structure is formed into a long strip extending along the length direction of the first shell wall. The pole body is arranged at the center of the first adapter structure and has a circular outline.

19. The battery cell according to claim 16, characterized in that: The first adapter structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged in the center of the first adapter structure and has a circular outline; The conductive portion includes a pole ear portion and a conductive member connected to the pole ear portion, the conductive member includes a first conductive segment laid on the inner end surface of the pole body, and a second conductive segment offset from the inner end surface of the pole body, the second conductive segment protrudes relative to the first conductive segment in a direction away from the electrode component, and the pole ear portion is connected to the second conductive segment.

20. The battery cell according to claim 4, characterized in that: The outer contour of the orthographic projection of the first accommodating groove on the first shell wall is located within the outer contour range of the orthographic projection of the pole body on the first shell wall.

21. The battery cell according to claim 4, characterized in that: The first adapter structure includes a surrounding portion located on a side of the pole body close to the electrode component, the surrounding portion surrounds a avoidance hole, the pole body is covered on a side of the avoidance hole away from the electrode component, the first accommodating groove includes a first groove surrounded by the surrounding portion and the pole body and recessed in a direction away from the electrode component, the conductive portion is connected to the pole body through the first groove, and the outer contour of the orthographic projection of the first groove on the first shell wall falls within the outer contour range of the orthographic projection of the pole body on the first shell wall.

22. The battery cell according to claim 21, characterized in that: The first transition structure bulges relative to the first shell wall in a direction away from the electrode component to define a base groove that is recessed relative to the first shell wall in a direction away from the electrode component, the base groove is open in the direction of the electrode component and is connected to the side of the first groove facing the electrode component, the conductive portion extends into the first groove through the base groove and is connected to the pole body.

23. The battery cell according to claim 4, characterized in that: The pole body includes a first pole piece and a second pole piece, the second pole piece is connected to the first adapter structure and defines a matching hole, the first pole piece is assembled on a side of the second pole piece away from the electrode component and covers the matching hole, the first accommodating groove includes a second groove surrounded by the first pole piece and the second pole piece, and the outer contour of the orthographic projection of the second groove on the first shell wall falls within the outer contour range of the orthographic projection of the pole body on the first shell wall.

24. The battery cell according to claim 23, characterized in that: The first transition structure bulges relative to the first shell wall in a direction away from the electrode component to define a base groove that is recessed relative to the first shell wall in a direction away from the electrode component, the base groove is open in the direction of the electrode component and is connected to the side of the second groove facing the electrode component, the conductive portion extends into the second groove through the base groove and is connected to the pole body.

25. The battery cell according to any one of claims 1 to 3, characterized in that: The pole component is covered on a side of the first shell wall away from the electrode component, the pole component comprises a pole body, a second adapter structure and a second insulating structure, the second adapter structure surrounds the pole body and is connected to the first shell wall, the second insulating structure is insulated and fitted between the second adapter structure and the pole body, and the conductive part is connected to the pole body; The first shell wall has a mounting hole, a sealing ring is arranged around the mounting hole, the sealing ring is clamped between the pole component and the first shell wall, the pole component and the sealing ring form a second accommodating groove which is recessed in a direction away from the electrode component, and the accommodating groove includes the second accommodating groove.

26. The battery cell according to any one of claims 1 to 3, characterized in that: The pole component includes a pole body, the conductive portion is connected to the pole body, the pole body includes a first pole piece and a second pole piece, the second pole piece is connected to the first shell wall and defines a matching hole, the first pole piece is assembled on a side of the second pole piece away from the electrode component, and the accommodating groove includes a third accommodating groove surrounded by the first pole piece and the second pole piece.

27. The battery cell according to claim 3, characterized in that: The inner end surface of the pole body includes a matching area that participates in defining the slot wall of the accommodating slot, the conductive portion is connected to the matching area through the accommodating slot, and the matching area is formed as a long strip area extending along the length direction of the first shell wall.

28. The battery cell according to claim 3, characterized in that: The inner end surface of the pole body includes a matching area that participates in defining the slot wall of the receiving slot, the conductive portion includes a pole ear portion and a conductive member connected to the pole ear portion, and the conductive member is connected to the matching area through the receiving slot.

29. The battery cell according to claim 28, characterized in that: The conductive member includes a first conductive segment laid in the matching area, and the conductive member includes a third conductive segment staggered from the matching area. The third conductive segment protrudes toward the electrode component relative to the first conductive segment, and the pole ear is connected to the third conductive segment.

30. The battery cell according to any one of claims 1 to 29, characterized in that: The first shell wall includes a protruding structure that protrudes in a direction away from the electrode component, and a mounting hole is penetrated through the protruding structure. The pole component is arranged at the mounting hole and forms a fourth accommodating groove with the protruding structure that is recessed in a direction away from the electrode component, and the accommodating groove includes the fourth accommodating groove.

31. The battery cell according to claim 1, characterized in that The electrode component includes an active material coating portion received in the receiving cavity, and a pole ear portion connected to the active material coating portion, wherein at least a portion of the pole ear portion is received in the receiving groove and extends to and is connected to the pole column component.

32. The battery cell according to claim 31, characterized in that: The pole component includes a pole body, a side surface of the pole body facing the electrode component is an inner end surface of the pole body, the inner end surface of the pole body participates in forming the accommodating groove, and the pole ear portion includes a gathering portion formed by stacking and connecting multiple layers of pole ear sheets, at least part of the gathering portion is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body.

33. The battery cell according to claim 32, characterized in that: The gathered portion is completely laid on the inner end surface of the pole body.

34. The battery cell according to claim 1, characterized in that The electrode component includes an active material coating portion accommodated in the accommodating cavity, and a pole ear portion connected to the active material coating portion, the conductive portion includes a conductive member and the pole ear portion, the pole ear portion is connected to the pole column component through the conductive member, and at least a portion of the conductive member is accommodated in the accommodating groove.

35. The battery cell according to claim 34, characterized in that: The conductive member includes a first connecting section, the first connecting section includes two clamping parts, the pole lug portion includes a pole lug end portion, the pole lug end portion is clamped between the two clamping parts and connected to the clamping parts.

36. The battery cell according to claim 35, characterized in that The pole component includes a pole body, and the surface of the pole body at one end facing the electrode component is the inner end surface of the pole body. The conductive member includes a second connecting segment, and the second connecting segment is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body. The conductive member is bent at the connecting position between the first connecting segment and the second connecting segment so that the first connecting segment is located on the side of the second connecting segment away from the pole body, and one of the clamping portions is supported on the side of the pole ear end away from the pole body.

37. The battery cell according to claim 34, characterized in that The pole ear portion includes a gathered portion formed by stacking and connecting multiple pole ear sheets, and the conductive member includes a first connecting segment. The gathered portion is stacked on one side of the first connecting segment in a thickness direction and connected to the first connecting segment.

38. The battery cell according to claim 37, characterized in that: The pole component includes a pole body, a surface of the pole body at one end facing the electrode component is an inner end surface of the pole body, and the first connecting section is supported on a side of the gathering portion away from the pole body so that the gathering portion is clamped between the inner end surface of the pole body and the first connecting section.

39. The battery cell according to any one of claims 1 to 38, characterized in that: The pole component includes a pole body, and the electrode component includes an active material coating portion accommodated in the accommodating cavity, wherein the active material coating portion is connected to the pole body through the conductive portion, and the conductive portion is bent to form at least two open grooves, wherein the opening directions of the two open grooves are different and the two open grooves are adjacent to each other in the direction from the pole body to the active material coating portion.

40. The battery cell according to claim 39, characterized in that The electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion is connected to the pole column body through the pole ear portion, and the pole ear portion is bent alone to form two adjacent opening grooves with openings facing opposite directions; or, the electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion includes the pole ear portion and a conductive member connected to the pole ear portion, the pole ear portion is connected to the pole column body through the conductive member, and the conductive member and the pole ear portion are bent together to form two adjacent opening grooves with openings facing opposite directions.

41. The battery cell according to any one of claims 1 to 40, characterized in that: The electrode component includes a plurality of electrode assemblies which are stacked, and the electrode tabs of the plurality of electrode assemblies are gathered toward the receiving groove.

42. The battery cell according to any one of claims 1 to 41, characterized in that: The shell component includes a shell body that participates in forming the accommodating cavity, the shell body is a semi-closed cylindrical shape and has an opening at one end, and the end of the shell body opposite to the opening serves as the first shell wall, or the shell component includes a shell cover that participates in forming the accommodating cavity, the shell cover is a flat plate and serves as the first shell wall.

43. The battery cell according to any one of claims 1 to 42, characterized in that: It also includes a pressure relief device, which is arranged on the shell component and is located on the same side or the opposite side as the pole component.

44. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-43.

45. The battery according to claim 44, characterized in that The battery comprises a box body, the battery cells are multiple and are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

46. ​​An electrical device, characterized in that: Comprising a battery according to claim 44 or 45.

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